Nova runs beautifully on my G3 and quite a bit smoother than the stock LG launcher. However, the LG launcher is very good and there is a lot of customization available.
One thing I've noticed about the QHD display is that it exposes apps with low-res icons. Nova doesn't display these icons any better, but if you use an icon pack with QHD support, you can expect crystal clarity.
The buttery Nova animations with this amount of Ram, SOC & display = WOW!!!