Digital Foundry are certainly singing it's praises. "best looking game releasing this year" and "might go down as one of the best launch titles of all time". It's interesting to note that all footage we have seen so far is from the 60fps performance mode, rather than the 30fps high graphics mode. Which is unusual.
Edit: Apparently the 60fps mode has been optimized further too and pushing higher resolution, now runs in dynamic 4k rather than a straight 1440p.