Sony's 70-200mm f/4 II is Lighter, Smaller, Faster, and Adds Macro

Seriously considering this new 70-200 f4. We were saving for the f2.8 GM II but this is a whole lot cheaper and reviews are looking pretty good. As a hobbiest would you still go for the f2.8 even though it's another $1,200 more or would you even see the difference?