While I love to shoot landscapes, cityscapes, HDr, etc, etc, etc ---- More of my income comes from events, and hopefully soon, weddings. So to that end, 22 MP, high ISO and good quality, yeah, that sells me. If I was making enough on art sales to justify an art only camera, then higher MP with less options for high ISO would be awesome, but I'd rather have a camera that can produce good images for art, while also being versatile enough in low light to get the "wow" shots.
side bar note, I love all the cross comments from nikon users over here, who knows, maybe all the we want the MP people will jump ship to nikon, while all the we want high ISO performance folk will jump over to canon ---the more of this the merrier - I'll be glad to buy all this used equipment when it hits the market!