I've been using a 17" since the unibody first came out. I just went and played with the retina 15" today at the Apple store for about ten minutes. I was actually shocked at how good it looked at 1920x1200. I didn't have my 17" with me to do a side by side comparison, but I actually think the 15" was easier to read.
Before WWDC I was planning on getting an ivy bridge 17" to replace my core 2 duo, and afterwards I was worried about losing the much needed desktop area when it became obvious that the 17" was MIA. Well, I've put that worry to rest now and am anxiously awaiting the new retina 15. 😀