First things first: Tim, you put the better known review sites and 'commentariat' to shame, this is exactly the hands on 'all of process' analysis needed - not more 'weak corners at the extreme wide end', which most all mid zooms show as a trade-off for the extra functionality of a 3x. You buy one for the whole range and the point re keeping the sensor clean - both ring true for those who need to minimize down time given over to lens swaps. Too much of this can make you feel like a 4x5 shooter -;
I agree this is the key lens for the FE system, it has great specs but had to about match the DSLR Canon / Nikon offerings overall, so sophisticated users can buy an a7r / 24-70 kit and be well pleased. Just to add something people might find - what will eventually do in the mirror flappers for non-pros is the first time they pick one up after using an a7 /a7r for a while..they feel a bit like something made in the Soviet Union, lol.