I just switched from an early 2019 Model 3 to a 2022.
Here is the list of differences I compiled while deciding if the change would be worthwhile:
- upgraded to MCU3
- upgraded to HW3 (after April 2019)
- basic autopilot included (after April 2019)
- maximum EPA estimated range improved from 310 to 358 miles
- matrix LED projector (a.k.a Global) headlights
- black exterior trim (chrome delete)
- improved side marker cameras (no light leak to blind camera at night)
- new center console design
- heated steering wheel
- heated wipers
- heated charge port
- external speaker (pedestrian sound generator)
- heat pump
- climate control passenger detection (closes passenger-side dash vents when seat is unoccupied)
- redesigned wheels
- redesigned aero wheel covers
- power trunk lid
- trunk seal redesigned
- metal scrollers on steering wheel
- wireless phone charging
- usb-c ports front and rear
- usb in glovebox for sentry mode/Tesla cam
- 128GB usb drive included
- matte interior trim (no piano black)
- new door latch button icons
- dashboard trim wraps onto front doors
- laminated side glass (front only)
- Li-Ion battery replaces less reliable 12v lead-acid version
- rear door speaker grills now circular
- center dash speaker deleted
- smaller frunk
- frunk mat no longer included
- rear deck center grill opening removed (reduces road noise, but also reduces subwoofer volume in cabin)
- passenger seat lumbar adjustment deleted
- radar deleted
- homelink no longer included (separate online purchase ($350 USD) and service appointment required for installation)
- michelin primacy mxm4 tires revised from T0 to T1 (if equipped - there are some hankook kinergy GTs in the mix)
I should also mention anecdotally that my new Model 3 seems quieter inside - less road and wind noise, and body panel fitment is more precise.