Differences between PS3 and PS4 besides graphics?

[Kosmos992k]

Best thing you can do for either console is add an SSD/Hybrid SSD.

PS4's HDD is plenty fast, adding an SSD speeds some things up, but the degree of improvement when adding a SSD on a PS3 is like night and day.

The thing is that the HDD in a PS4 is a pretty standard 2.5-inch laptop drive, so you get load performance equivalent to a laptop running the game. Yes an SSD will improve things a bit, but it's not like the PS4 is suffering long load times.