Even if some of the much-discussed image and performance improvements are minimal, I am happy with just about everything I read about the 5D3. I elected to get a pre-owned 5D, and then wait to see what the 5D3 offered, and am glad I did so. (The money saved enabled me to buy a 580EX II.) The dual memory card slots, alone, justify my waiting, and for the 5D3 to have been made to be much like my beloved 7D cameras will be a big plus when/if I do eventually buy a 5D3. At this point, the only DSLR competing with the 5D3, for my attention, is the 1D X. The prices of a 5D3 plus battery grip will put me within financial striking distance of a 1D X. If Bjorn can patiently save money for a Leica M9 and Leica lenses, I can save for a 1D X, for which I already have lenses.
Canon 7D2/7D/5D/40D/1D2N/M3; Nikon F6/D700/FM3A/1Dx/Coolpix A; Canon 40mm 2.8 STM, 135L, 50L, 35L, 50mm 1.8 I, 100mm 2.8L Macro, 10-22mm EF-S, 400mm 5.6L, 16-35mm 2.8L II; Nikkor 50mm 1.2 AI-S, 50mm 1.4G, 50mm 1.8D, 16mm 2.8D Fisheye, 180mm 2.8D, 100-300mm 5.6 AI-S, 45mm 2.8 AI-P, 14-24mm 2.8G, 24-70mm 2.8G, Micro-Nikkor 60/2.8G; Voigtlander 90mm f/3.5 SL II, Zeiss ZF.2 2/135 APO