Yeah - they're in a different world performance wise. Sat here working away actually on JUST the 13" rMBP non-touchbar. Has Windows 10 running in Parallels, and a load of RDP sessions up on the big screen. No way could my small Macbook cope with that.
My impression of the machine is highly positive. Keyboard is a bit noisy - only thing I can really think of.
I remember being on the train sorting through a load of cr2 files and it was taking about 5 seconds to preview one file. I just gave up. I'm wondering whether to go for a 13" one, a 15" one or wait for Kaby Lake.