Apple iPhoto clarity with Yosemite

Anybody who upgraded to Yosemite notice a spectacular sharpness improvement? - I'd guess at 20 percent.

I presently have three computer systems: The most fully upgraded consumer Mac one can purchase; booted to both Yosemite and W10 (not a typo W10), another 12 core laptop also tethered to a secondary monitor (tri-boot), and a third pc server.

I sincerely like Mac for most things; the name Mac all by itself, most of the operating system (although there were some major WiFi issues), etc...

But even though the MacPro 12 core is indeed maxed out (again the 12 core), also with dual ADM 700's, etc... Somehow it just doesn't make the screen presentation that a pc does. Sad but true.

I really wouldn't mind boosting up my present MacPro 4k screen a bit higher, or looking better in any way