GT, in my "review" I mentioned that we had a comparison with an S900. He uses a G2. But I have't printed any of his photos, although his look very nice. A very slight tendancy towards blue on outdoor pictures, but very nice. The detail is excellent.
One of my co-workers here just bought a G3 and then he bought a Canon i950 for it (he's since become an even bigger advocate of it than I am). His photos look fantastic.
As far as Epson, having looked at the output of two newer Epsons (Epson 925 and the larger format one... a 1120?) very close up I'd say that it is similar enough in quality to the Canon as to be very difficult to judge the winner between the two.
Lastly, as regards paper, a friend (the one with the G2) hung up the same photo printed on 4 types of paper (Ilford Gallerie, Red River Polar, Epson Photo, Canon Photo Pro). The fade test has been running for 4 months now and there is a clear loser in the group. The Epson, Red River and Ilford all still look fine, but the Canon (printed on a Canon S900 printer using the same inks that are in the i950) has noticeably faded towards orangeish/bronze. I highly recommend buying high-end photo paper for the best quality prints, but I'm becoming less enamoured with Canon Photo Pro paper every time I look a the "wall of fade" in my friend's office. Red River Polar is my current favorite for my i950.