I know there's a lot of folks waiting for feedback on the 4674. I picked mine up at the airport yesterday, and set it up last night, so I haven't had much time to check in. But let me give a quick synopsis of my impressions so far before I sit down for a day of football bliss.
The set has definitely met my expectations. HD stuff looks great. Although, this being my first HDTV, I am surprised at the variability in the HD signals.
For example, the Clemson-Miami game looked good, but the boxing on Showtime HD was much better. You could see the sweat on the boxer's foreheads. I really like the black levels - one of the fighters was wearing all black trunks, and it was darker than the black speaker it blended in with on the bottom of the screen.
I calibrated the set with Avia. Out of the box, contrast was 100. I set it down to 80. Here are my full settings:
Brightness: 41 (turned way down from the factory pre-set. This is a bright set!)
Tint: Not adjustable using HDMI or DVI
One other note - the manual is awful. Clearly not proofread. For example, the manual's selection of screen formats does not match the actual selecton on the TV - looks like they left in some stuff from the HLN manual. Owning two Denon products, I've become accustomed to bad manuals, and this one definitely qualifies. But that's a minor complaint - PQ is terrific.
Another thing I was concerned with was glare, as I have a double door of windows right next to the TV. Glare is non-existent - I can watch this set with all of the lights on and the curtains open and not see any reflection. A big improvement over the CRT it replaced!
As for some common problems, I do not have audio sync issues (yet) - with an optical feed from my RCA DTC210 to Denon 3802 for sound. I've never seen a rainbow, so I'm probably not the right person to ask. The operation is very quiet - no noticable fan noise unless you mute the TV and put your ear against the set.
Finally, the package was very easy for my wife and I to carry. The box had built in handles. My advice, if you buy locally, have access to an SUV, and the store doesn't offer free shipping - take it home yourself.
I'll post more later, with pics. Gotta go watch the J-E-T-S Jets Jets Jets.