Last Monday we had a lecture to mark the 60th Anniversary of our camera club (http://www.edmontoncameraclub.co.uk/) from Andy Rouse (http://www.andyrouse.co.uk/), a well known wildlife photographer in the UK. He uses Canon gear and used to rave about the Pentax 645nII, but has gotten rid of it since getting the 1D Mk2. He says he gets far better quality and better workflow from digital than from MF at any conceivable output size, including billboard.
He promotes RawShooter as the best software, and doesn't like gross manipulation, just levels adjustments and the like. The only time he's used image manipulation was on a primate picture of mother and infant that showed a nipple - apparently it would be unsaleable in America. Incidently, he says he doesn't like Canon, and has a better relationship with Nikon and Pentax, but at present they don't provide the tools he needs. He is a very entertaining speaker and I recommend that you try to see him if he is in your area. Nick