Thanks for posting Dom & Stef... both look pretty good to me. The 1:1 crops are something like 1.5m wide by 1m high with 75dpi 24MP files (screen resolution), so any softness & CA's will probably disapear even on A2 prints!
I have been very pleased with the results of the a900 + KM 17-35 - considering what the tests shots looked like.
I must admit, the longer I own the a900 the more I think that even 'average' lenses perform pretty well.
Obviously the higher end lenses will make the most of the a900, but you can get decent results on most FF lenses. The only lens that hasn't really worked for me so far, was my Tamron 24-135 SP. Great lens on the 7D, not so great on the a700, and terrible on the a900. Might have been better stopped down a bit - but wasn't very fast to start with.