Display:

• Dynamic Island instead of notch
• 1-120Hz variable refresh rate vs fixed 60Hz
• Always-on capability
• Higher max brightness
• marginally smaller bezels

Camera:

• Larger, 48 Megapixel main sensor vs 12 Megapixel (though still larger than the 13, same as the 13 Pro I believe)
• 2x full 12MP zoom 'virtual sensor' using the central 12 MP of the main sensor
• Better ultrawide sensor with autofocus and macro mode
• 3x zoom sensor vs none
• LiDAR sensor enabling night mode portraits
• ProRAW

Miscellaneous:

• A16 chip vs A15 (but it is the one with 6GB of RAM and an additional GPU core from last year's Pros)
• steel vs aluminium frame
• matt back with glossy camera bump vs shiny back with matt camera bump
• different colour options

I think that's more or less it.