Sigma should stick to making lenses, they really know how to produce bad, ugly cameras.
Good to see Tamron investing into M43. Having used Tamron lenses with my D7000 along with Sigma and Nikon, this will be a nice addition to m43. I'm more of a prime man myself so will eagerly await to see what primes they come out with :)
All the cameras are great. Personally being a Nikon man I think the D800E is a better camera than the 5D MkIII though I wouldn't say no to any of the top three :)