Dude you don't need to wait any longer to see the gulf in class between him and Pogba. It's possible Pogba might still have consistency issues in a few years while Keita has none at all, and over the course of the season that might make him the better performer in something like 1 out of 4 seasons, but you can't not see the difference in talent.
Keita's looked quite promising on a few occasions, and I agree with
@B20 that he's shown he's got a level or two above Wijnaldum in his locker. Does seem strange that he's found it so difficult to integrate though, the conditions seem almost perfect. Similar style of play, happy dressing room, a need for an upgrade in his position. The only thing that seems to be going against him is Klopp has moved him around a bit, but then that's at least in part down to Keita being poor in his best position every other game.