Went through the 'compare' section on the Apple website to look at every single spec difference, big or small. All are listed below (apart from the different color options).
Main differences - slightly bigger display, slightly better processor, Camera Control button, all round more feature rich cameras which seem more geared towards pro video/audio capture, around 10%-12% better battery capacity (approx), very slightly taller and wider but 12 grams heavier (noticeable IMO), slightly better thermal dynamics. Oh, and WiFi 7 instead of 6. No upgrade to Bluetooth though.
First time I'm seriously considering NOT upgrading, there really aren't any worthwhile differences IMO, and it's heavier.
16 Pro (compared to 15 Pro)
6.3" display (versus 6.1")
2622 x 1206 resolution (higher res, but same PPI of 460)
A18 Pro (versus A17 Pro)
Camera Control button
Camera - 48MP "Fusion"
Camera - 48MP Ultra Wide
Camera - 48MP macro photography
Camera - Record Spatial photos and videos
Camera - 5X Max Optical Zoom (instead of 3X)
Camera - Anti-reflective lens coating
Camera - Video - Record video Dolby Vision up to 4K 120
Camera - Video - ProRes up to 4K 120 with external recording (up from just 4K 60)
Camera - Video - Studio quality four-mic array
Camera - Video - Wind noise reduction
Camera - Video - Audio Mix
Battery - 27 hours video playback (+4 hours)
Battery - 22 hours video streaming playback (+2 hours)
Battery - 85 hours audio playback (+10 hours)
Latest generation Ceramic Shield (stronger than 15 Pro)
MagSafe wireless charging up to 25W with 30W adapter or higher (lower on 15 Pro)
1 nit minimum brightness (no listed minimum for 15 Pro)
Taller by 3mm
Wider by 0.9mm
Heavier by 12 grams
WiFi 7 - 802.11be (upgrade from WiFi 6)
Main differences - slightly bigger display, slightly better processor, Camera Control button, all round more feature rich cameras which seem more geared towards pro video/audio capture, around 10%-12% better battery capacity (approx), very slightly taller and wider but 12 grams heavier (noticeable IMO), slightly better thermal dynamics. Oh, and WiFi 7 instead of 6. No upgrade to Bluetooth though.
First time I'm seriously considering NOT upgrading, there really aren't any worthwhile differences IMO, and it's heavier.
16 Pro (compared to 15 Pro)
6.3" display (versus 6.1")
2622 x 1206 resolution (higher res, but same PPI of 460)
A18 Pro (versus A17 Pro)
Camera Control button
Camera - 48MP "Fusion"
Camera - 48MP Ultra Wide
Camera - 48MP macro photography
Camera - Record Spatial photos and videos
Camera - 5X Max Optical Zoom (instead of 3X)
Camera - Anti-reflective lens coating
Camera - Video - Record video Dolby Vision up to 4K 120
Camera - Video - ProRes up to 4K 120 with external recording (up from just 4K 60)
Camera - Video - Studio quality four-mic array
Camera - Video - Wind noise reduction
Camera - Video - Audio Mix
Battery - 27 hours video playback (+4 hours)
Battery - 22 hours video streaming playback (+2 hours)
Battery - 85 hours audio playback (+10 hours)
Latest generation Ceramic Shield (stronger than 15 Pro)
MagSafe wireless charging up to 25W with 30W adapter or higher (lower on 15 Pro)
1 nit minimum brightness (no listed minimum for 15 Pro)
Taller by 3mm
Wider by 0.9mm
Heavier by 12 grams
WiFi 7 - 802.11be (upgrade from WiFi 6)