Both cars are running 12.5 -- and I agree that it's dramatically improved over 12.3.
I really enjoy driving. I've got a #vanlife Sprinter that I'll do 14 hour roadtrips in with my kids. For me, the Tesla's self-driving capability is a "nice to have" -- it sometimes drives like a 16 year old who just got their license (especially around braking. Somehow it's really hard to nail the "soft brake at a stop sign" which seems like it should be be easy. I find that passengers in the car are most uncomfortable when the car brakes like this -- and I'm the most embarrassed because they all look at me like I completely forgot how to do a smooth stop at a stop sign).
Other times, the Tesla's self-driving is magical and nearly flawless -- especially on long highway road trips, like up to Tahoe. Even someone like me who loves doing road trips really appreciates the ability to relax and not have to be driving.
But here's one observation I've had that I don't see quite sufficiently represented in the comments:
The other person in my family with the 2021 Model Y does not like to drive like I do, and they really appreciate that the Tesla is a better driver than they feel themselves to be. And as a passenger in their car, I also really appreciate that when the Tesla is driving, I generally feel much more comfortable in the car. Not always, but often.
There's so much variance in us as humans around driving skills and enjoyment. It's easy to lump us together and say "the car isn't as good as the human." And I know there's conflicting data from Tesla and NHTSA about whether in aggregate, Teslas are safer than human drivers or not.
But what I definitely know from my experience is that the Tesla is already a better driver than many humans are -- especially those that don't enjoy driving. And as @modeless points out, the rate of improvement is now vastly accelerating.