I havent seen him enough to be as clear about him as Fred, but I think he is a great dribbler, joy to watch and good player from what I have seen. I understand the reservations about wether or not he can cut it at a top club or not. I felt the same about about Kader Keita as with Sessegnon, ridicolous fun to watch, but Kader didnt cut it at top level (doesnt mean Sessegnon wouldnt, just similar type of entertaining players, though Sessegnon way more explosive).
Btw, I know you rate Okocha, anyone sane does, I just meant to stress that he was special as fuck (and lazy as fuck), Sessegnon or very few else deserve to be compared to him.