I have a 35mm F2 and both my bodies are APS-C. It's a useful lens. It *loves* the Sunny 16 rule. Set it and forget on a nice day. The buzzing is not that bad because it focuses quickly. It also makes for a decent macro lens when paired with an extension tube.

I've been reading David duChemin and he suggests using one lens exclusively for a week or so to really become familiar with it. I've been thinking that this would be a good way to see if the 35mm F2 can grab images my 24-105 cannot. I'll be using only the 35mm F2 this week. I'll post some images in this thread.