I would hardly call it a parts bin bike, more new parts than old, including the frame, wheels, pistons etc.
Two different bikes you are comparing there, probably easier to compare it with the Z1000 rather than a ninja.
I had the GSXR 750 K8 which I sold to buy this one. This is a much better bike in many ways. And I just don't just mean comfort.
As for risers. being tall I never needed them : - ))
All comes down to taste and what you want it for. Don't over think it, just go with the one that gives you that warm fuzzy feeling when you see it.