Job system is exactly the same. The only difference Granblue treats the different jobs/classes as your MC in different roles and outfits, while KamiPro has its own character for each job. So the tier 1, 2, and 3 healers are different characters with their own scenes instead of just the MC in a different outfit.

Summons bring active and passive effects just like Granblue along with the stats they provide. There are weapon grids just like Granblue, one main hand and nine other weapons in the pool so you'll build wind, water, etc grids just like in Granblue. There aren't as many weapon types at the moment, however. I've only seen HP up, attack up, and enmity weapons from what I remember, and they come in small, medium, and large just like Granblue. The weapon skill up and uncapping is also, surprise, just like Granblue.

As someone who's played Granblue for almost a year, I can tell you that this game is pretty much just like Granblue. Granblue definitely has more depth to it, has a bigger team and budget, and over all a better quality. It also has an English translation built into it so anyone who wants to play it isn't stopped by the language barrier. Granblue is undoubtedly the better game of the two by a wide margin, but let's face it: we're in it for the porn.