I watched tests of ssd on PS4 and its not faster at all, maybe a few seconds but the PS4 seems to be hardware limited so SSD's have little effect on the PS4, seems 7200RPM is also little better than a 5400 rpm, seems to be the way they optimized the loading? (BF4 on my PS4 takes 20 seconds to load a map, on my PC HDD 4 min, SSD 1 min) That's why i upgraded my PS4 HDD to a 2TB 5400 one and it's awesome.

I'll make a video to show the lagg on PS4 in 10 min and you can see how chronic it really is, i have a GTX 970 on my PC and on normal NPC quantity i'm lucky if i get 30 fps in Mor.