literally it is a great great lens , almost perfect , no doubt about it.
but it is just too huge , it is longer than the Nikon 24-70mmf2.8G, I think the size makes it just an impractical lens for many.
I do not mind 4k for a lens of this great, but I do really hate the huge long ugly barrel design.
So I will use my Zeiss 50mm f2 MP for another few years.
if you guys do not mind the huge 50 kind of lens , then just get it , there is nothing comes close to it at least in a lab test.