I think this obvious question is worth asking, because it will give an idea as to the pull this camera system has. With the A7R - the big seller - we all think the 36MP has been the big pull, but has it? Me first:
1. Dynamic Range (I am doing a lot of night work and the 5D III banding issue is no longer tolerable. Dfine is standard workflow). I struggled over the A7 or A7R decision and went for the latter when I realised noise would be better controlled after downsampling vs the native 24 MP file of the A7.
2. EVF (I have some eye issues, shoot into the sun a lot, and don't want to be looking at the sun through an optical finder. Dislike rear LCDs for shooting).
3. Lack small, portable colour system (Have 5D III and Monochrom).
4. Resolution (36MP will be a nice boost over 22mp for those 30+ inch prints)
Cost (The pricing of bodies means I can likely remain in the game in future generations. The same cannot be said of Leica M or even Canon. I think their pricing has gone nuts lately and their high MP bodies may have monstrous prices. Hell, even the 5D III sells for about GBP 2400 today!). I may retain one film M, those lenses that work well on the A7R and sell out of Leica M all together. They have not produced any modestly priced M mount cameras and GBP 5000 is the starting point. Its therefore a dead system for me. In this regard, I feel very disappointed in Leica.