I sit about two and a half feet back from my 43" Acer Predator. Text sizes on a 34" are similarly sized without using font scaling and I don't in either case. I actually went from a 34" to a 43" after coming down from a 48" TV. Basically, 34" wasn't enough real estate for productivity or immersive enough for me while gaming.
I seem to have to point this out a lot, but you don't need to sit super far away from big displays. If anything, that defeats the purpose of having a big display. You want to fill up as much of your peripheral vision as you can use effectively. 48" was too big but 40-43" is perfect in my opinion. I've got a 40" 4K TV on the test bench and the 43" on my main rig.
I didn't arrive at these conclusions lightly. I've had every size of display you can think of and often more than one. I've had 48" and 60" TV's, 43" monitors and even 3x30" displays in NVSurround for a total of 7680x1600 pixels. I've had 3x2560x1440 27's in portrait and landscape modes, etc. I also spend upwards of 18 hours a day on a computer, sometimes more.
That's the side effect of having gaming as a hobby and doing two jobs that both require the use of computers. I still have other displays in use around the house. 32" 2560x1440, 28" 4K, etc. I wouldn't have anything less than a 38" or 40" in use on my main gaming rig. That's also the one I right my reviews on. Sometimes, I could do with additional monitors on that one.
I also had a Galant from IKEA back in the day. Although, I had the full wrap around / L-shape desk and used the corner for my main display. It worked fine for large monitor arrays.