If your worried about the screen, don't be. The rest of the phone is pretty sweet, especially the keyboard. If you want to go tit-for-tat kinda deal, then yeah you can notice some differences between the D1's screen and D3. All in all, no biggie, definitely liveable. Personally, the D1's screen was better, the D3 does show some instances of "mesh" on certain images, notably the battery, but you reallllllly gotta be looking for it.
I've studied that battery, because the checkers are most noticeable on it. I think it is a combination of the color with a bit of transparency on a pure black screen that makes it exaggerated. If I were a ROM designer, I'd probably go after that first thing.