I admit that my G9 + EF-S 17-55mm f2.8 example may have been a bit extreme since:
- There are smaller constant f/2.8 APS-C zooms around (Tamron and Sigma)
- The G1X sensor is slightly smaller than APS-C
- The flange distance is shorter than an EOS SLR
However, none of us really know what a constant f/2.8 lens for a large-sensor mirrorless camera is going to look like since no manufacturer has built one yet. The closest we've seen are the mock-ups for the Panasonic 12-25mm m4/3 lens, but that particular lens has been on the rumour mill for quite some time now.
I find it hard not to like the G1X. Despite the complete change in design it sounds exactly like every G-series camera has since the G7: solid, dependable, great controls, a bit slow...but this time it features virtually DSLR image quality. I think that in practise it will be a much better camera than it's lens specs and the early reviews might suggest. Serious bokeh junkies need not apply