The TV won't actually be my main display. It will be a 3rd screen. My main monitor, directly in front of me is a 30" PC monitor (I need a pro monitor for colour accurate work), to the right is a 24" monitor in portrait mode to help with Photoshop work, to my left at the moment is a 46" LCD TV which I use for media consumption and gaming. It sits at an angle across my desk facing me. The 48" LG OLED is actually the same dimensions as my current 46" TV because of thin bezels. 55" I could just get in to fit, it will be a bit of a squeeze but I can manage.
The size does not bother me TBH. I have always had large screens on my desk (I still remember people telling me that 30" monitor will be way too big for desk use a few years back when 24" was most popular size, I sit less than 2 feet away from 30" screen). When I do use the TV, I usually kick the chair back a couple of feet and watch / game sitting back on my reclining chair. I'm worried a bit about seeing pixels hence the question.