If you're using nightlies and haven't upgraded in a while I'd strongly suggest doing so... The new accelerated schematic canvas is super, super nice. It's now as buttery smooth to scroll and zoom as the PCB editor! Really improves usability significantly.
I did have some aliasing problems, but I'm on OSX on a scaled retina display which might be the cause. I suspect the same thing might happen on Windows with a 4K display if you run scaled. Setting it to 4X oversampling fixed it for me; so if it looks aliased when zoomed out, try that. Switching to "Legacy" didn't make any difference.
Definitely worth checking out!