Being a hermit, I find Shadow Fall to be very impressive looking. It's definitely the best looking PS4 launch title, as well as one of the best looking next-gen games out. Ryse? Not so much.
I don't understand how someone could enjoy Shadow Fall's visuals but find Ryse unimpressive. Ryse has far superior facial expressions, character animation, and lighting. It's also consistent all the way through. ShadowFall can easily look like an early PS3 game at times.
Killzone's SP looks extremely good 95% of the time, lacking things on the screen that I'd consider ugly. Ryse always looks ugly outside of the cinematics. Always some poor texture, unimpressive shaders, etc. It only has impressive cinematics really.
Shadow Fall's Single player takes a serious drop in quality as soon as you reach chapter 5. ShadowFall can look ugly in both its cinematics and its gameplay.