Martin was very consistent last season, whenever i've watched him this season. he's been good as well. He was even impressive when given a chance to play for the NT. I like him very much and rate him highly.
Lacazette looks like a talented player, he gets a few cameos here and there for Lyon. Quite a good dribbler, though the jury is still out on him until he gets more opportunities.
Cabella, i haven't seen enough of. He doesn't get much starts with Montpellier. From the little i've seen i don't think he's anything special though. I'm actually surprised you know him.
Sanogo is a very young player, but despite that is already getting some playing time for Auxerre. Haven't seen enough of him either, but i can tell you the guy doesn't look 18 at all, he's very physical and strong for someone his age.
I don't rate him very highly. I think PSG can do better than him. He's too lightweight and quite inconsistent, that being said he's a good finisher, theres no denying that.