I have found with SF the higher up the hierarchy the greater the depth and fullness of the sound and the lower the volume required to be satisfying. I would say the speakers you contemplate would be a very significant upgrade and would make you very happy. The Nova III are stunning performers.
I owned Olympica 3 for many years and have auditioned the Nova 3 repeatedly. These would take you out of the speaker market for a very very long time. If you get hit with upgrade -itis, you would be able to upgrade your components additional gains for a long time.