We're not going to get him, but Marvin Harrison Jr. is about as smooth a receiver with as much ability as you can imagine.
I'm going to give you one reason why I really like Drake Maye. Watch the first play in this cutup. The rest are somewhat impressive, but the first one is the throw/play which basically convinced me Maye was the guy. In all of the McCarthy tape I've watched (which isn't all of it, but some of it now), I haven't seen one throw that approximates this throw. Nor Daniels. I don't think this throw is even available to him. (Granted, there are things available to Daniels which are not available to Maye and McCarthy.
Maye takes the snap. Immediately notices the CB allows the primary receiver in the slot to cut behind him. This immediately gives the receiver inside deep leverage. (PS, this is horrid technique by the CB.) Maye checks the closing safety. The ball is released when the receiver is at the 12 yard line and he catches it at the goal line. It splits CB who is in trail position, and the closing safety. It's a great example of touch, velocity and accuracy. This ball left a vapor trail, it was essentially thrown on a frozen rope, but with enough loft to put it absolutely on the hands of the receiver. It's also fantastic timing. Throwing with anticipation.
This is an NFL play design, an NFL read, and an NFL throw. This play isn't even available to some NFL QBs. Mahomes, Josh Allen, Herbert, a few others, they can make this throw. I don't know if McCarthy can make this throw. I haven't seen it. Based on the way Daniels' ball floats, I don't think this throw is available to him.
I get you can't judge any player on one play. That's ludicrous. But at the same time, this play shows the ceiling on Maye is as high as just about anybody in the NFL now not named Patrick Mahomes. I'd take a bet on that.