I had a Leaf S with DC quick charger for 4 years. I have had my Bolt for 1 month.
Overall a really great improvement. Torque and drive are much better. Much tighter. The Leaf handling was sloshy.
The range improvement is obviously tremendous.
The problems I have with the Bolt vs. the Leaf:
1) Interior fit and finish- too many cheap things. Cheap plastic with sharp edges in several places in the interior
2) The trickle charger cord is quite thin compared to the Leaf's. I realize this is picayune. But it represents Chevy doing things on the cheap
3) The charger port door is cheap. The Leaf one was solid. Felt like closing a safe when you closed it. And it had a light when the charger port door was opened. And it had a lock that could be set so nobody would walk off with your trickle charger
Overall, I am super happy. However, these items above to me represent Chevy's decisions to make things too cheaply in the areas that people use on a regular basis and detract from the overall quality feel for the car. In a few years when my Bolt lease is up and the Leaf has a comparable range, I will remember those differences.