The jump could that of 100x more horsepower or what ever. The casual gamer looking at the difference from PS3 and PS4 will just look at visuals and think the same thing some other gamers are thinking, the jump is just not that different.
The power difference does not matter if you can't even notice much of a difference visually.
It's the PS3.5, it's an improvement from the PS3, but no quite a PS4. Maybe in 2-3 years the graphics will really start to shine, but i'm not impressed right now.