The most impressive aspect of his game so far is his ability to buy time in the pocket and find the open man all the way through his progressions.
But some of that is also the 49er offense. Lots of short, intermediate levels, built in check downs they routinely utilize.
He's been really good playing within the system. What remains to be seen is if he can lead that last minute game drive where he has to make chunk play throws under pressure to go win it.
But no one has been able to routinely stop the 49er system while beating their defense often enough to take a big lead.