I received an 8 gb refurb yesterday. Week 34, screen 7455232. Firmware is 1.0.2 (and I'm not about to upgrade).
The screen looks great. On some of the screen tests, especially the Jay-Z cover test, the clarity does increase *slightly* if I tilt it back a little in portrait (for some reason, if I have the phone in landscape, tilting does nothing to improve it). I pushed the brightness all the way up, and if anything it looks better.
The screen might have the slightest of issues with negative blacks based on the Jay-Z test, but there are no dead pixels, it passed the other screen tests, and everything else is top notch. I'm certainly not about to start playing Russian roulette with my local apple store hoping to get a better one. Maybe if later on they admit there is an issue with my screen, I'll have it replaced-- but that's only once the dust settles and I know for sure the new screens are better.
I haven't compared it to a 5 series screen, so I guess I can't say for certain that it's every bit as good as those, but it looks pretty friggin' good!.