Only Nintendo can port a game to a new system and have it sell more than the original. The selling power of their games is impressive. I can't think of any other publisher with such a stable of game series that can sell by themselves. That might be a bit due to the reviews but say even if a Sony game gets reviewed a 95+ it doesn't sell this much this fast.
Eh, a bit of hyperbole here. Plenty of Sony's properties sell well, regardless of the speed. None of their franchises are as strong as Mario, but then, they don't have to be.
One doesn't have to keep up with the other in order for either to look good. On its own SMO has done great, just like, let's say, The Last Of Us (a title that did just as good on PS4 as it did on PS3 - to combat your first sentence), has for Sony.