It's easily as fun.
Better main villain, more unique stands, the usual Araki humor...
It has it all.
Ok, I'm officially hyped now!
Part 4 is sort of it's own beast, in ways but the protagonist is more like Joseph than Jotaro, but less cheap and goofy than Joseph was.
If this is any indication Persona 4 feels a lot like part4, if you are familiar with that game. It's sort about normal people wrapped up in a insane plot.
Persona 4? OK MY HYPE METER IS THROUGH THE ROOF