Okay, I'll give it a shot, based on my limited knowledge on the subject. Major differences...first off built in fridges are often smaller in size to their free standing counterparts because of the cabinet design. That is why you'll see a lot of 42inch+ BI fridges. My SZ is quite a bit smaller when compared to my old freestanding Kenmore. Also, the fancier BI fridges come with multiple compression units/vacuum sealing functions, heavier insulation, and usually (which is a pretty important factor) a very solid warranty for years. Also, the price differences. There is a much much much larger market for free standing less expensive fridges. It would be safe to assume that for every built in fridge that is sold, the major players (Kenmore, Whirlpool, GE, Samsung) probably sell 10 or 20 units. Supply and demand is a huge factor. The major brand fridges also make their products overseas to keep the costs down. A SZ, Viking, or Northland fridge would be made in the USA and that adds a lot to their price. Also, the major built in manufacturers sell primarily to high end installations where people are throwing around $100,000 or more for a remodel. These companies have a brand image of being good quality and, more importantly, expensive, the SZ pro48 is like 16 grand. You take someone who knows high end kitchens and show them one with a sub-zero, viking range, and what not, and they will automatically assume the remodel was expensive. Compare that to walking into a house with a Kenmore freestanding, a GE range, and a Samsung microwave. That looks more "pedestrian" (I am not using that word as a put down by the way). I like to put it this way to people. Think about it like cars. Sure you can buy a Toyota Camry for 25,000, it'll run well, fit all the stuff you need, and get you from A to B for years to come. That is the best selling car on the road so you'll see a ton of them. Now imagine buying a car that does same thing, but paying $150,000 or more for it (think a Bentley or something). It will do the same thing as the Camry, but it'll be more powerful, handcrafted, and look incredible while doing it for years to come, and you'll rarely see one on the road. People will know it does pretty much functionally the same as any other car, but it has an image, and people will know it's expensive. All fridges do one thing, they keep your stuff cold. Some preserve food fresher for longer if they have vacuum sealing like SZ, and I can tell you from experience it DOES keep veggies/fruit fresher a lot longer than my basement fridge. Sometimes extending the shelf life of the food for a week or two more, sometimes even longer. Anyway I hope that this helps answer your question.

I think it looks great as is. Your fridge is big and beautiful. As long as it is not blocking doors or windows. But if it really bothers you because of the look and isn't blocking anything: If the side is magnetic, add a magnetic shelf or two to it and it will look great. Or put a side rack less deep to make the difference appear tapered. We had to remove our top cabinet to be able to fit the height of our new fridge, that only required unscrewing the cabinet simply held on by screws, was easy. But all this talk about cutting into drywall and all that hassle (unless you are skilled in that sort of thing) otherwise it might be more work and hassle than it's worth unless the fridge is blocking something. We got these magnetic shelves and they look great and very functional too--> https://tinyurl.com/rab3rqm Personally I like big and beautiful fridges like yours and we only have about 33 inches width so no room for it, otherwise I'd have one like yours even IF it stuck out.

One thing about standard depth fridges - that extra few inches at the back tends to be space where items go to be forgotten about and die. So while it's nice to have extra/deeper in general, think about your actual fridge usage in daily life and gauge weather or not you would miss the extra space in the way-back. We have a FD CD and don't miss the fridge space in the least, BUT do miss the space that the freezer drawer seems to be lacking. We picked up a small upright freezer for the cellar, but that does more than a standard fridge freezer would for us anyway so it would have been on the docket regardless. So CD cost more and gives you less space, but it's worth it for us because it does not encroach beyond the cabinet & into the kitchen, plus it's fridge space not missed.

This is a freestanding fridge, so it does not affect the value of your house (or can be swapped out for the pictures if you have to sell). That care taken care of, measure carefully. Remember that many full depth fridges still need air circulation in the back, so make sure you're looking at the full footprint numbers, rather than the box depth. Draw it out on the floor with masking tape. If you're not in the space yet, do it where you are, and make tape versions of the nearby cabinets and island too. Fill with boxes. See if walking around the stick-outy fridge bugs you. See if you bump into it a lot. Because that wall is there, no matter what depth fridge you have, it's going to have to stick out so a left-of-picture hinged door can open completely or have a single door opening between you and the working part of the kitchen. This can actually be useful, because you can dump things on the island, but snack raiders and condiment snarfers can be more or less outside of the kitchen while they root around in the fridge. Play around with the possibilities and the tape and boxes, and you'll soon figure out which you want. There are pluses and minuses of each, but it's how you and your family with use it and what will please or annoy you that matters. That's different for everybody.