I googled this timeline so everyone's on the same page.
Sony
- 2010: E mount introduced
- 2011: E mount is licensed to 3rd parties
- 2016: Last dSLR (SLT) was announced
- 2019: Sony becomes #2 player displacing Nikon
- 2021: End of dSLR (SLT) manufacturing
As of today on BHPHoto from 2010-2022 there are
- 63 Sony-branded E mount lens-only SKUs with USA warranty
- 9 Sony-branded E mount full frame body-only SKUs with USA warranty
Canon
- 2018: RF mount introduced
- 2020: Last dSLR was announced
- 2026(?): End of dSLR manufacturing
As of today on BHPHoto from 2018-2022 there are
- 30 Canon-branded RF mount lens-only SKUs with USA warranty
- 5 Canon-branded RF mount full frame body-only SKUs with USA warranty
Nikon
- 2018: Z mount introduced
- 2019: Sony becomes #2 player displacing Nikon
- 2020: last dSLR was announced
- 2021: Z mount is licensed to 3rd parties
- 2026(?): End of dSLR manufacturing
As of today on BHPHoto from 2018-2022 there are
- 29 Nikon-branded Z mount lens-only SKUs with USA warranty
- 4 Nikon-branded Z mount full frame body-only SKUs with USA warranty
It has been reported that Canon Japan's CEO committed to 32 new lenses by year 2026.
https://www.canonrumors.com/canons-roadmap-includes-32-new-lenses-by-2026-according-to-canons-ceo/
30 current Canon-branded RF lenses + 32 future lenses = 62 unique lens SKUs before year 2027
vs
63 current Sony-branded E lenses + unknown future lenses.
It is guaranteed Sony/everyone else will release new lens SKUs that are
- updates to ~10 year old E mount lenses
- equivalent counterpart lenses of their 1st party & 3rd party competitors
- unique focal lengths & apertures that Sony pioneered
From 2018-2022 Canon Japan has put out key focal lengths that photo news agencies & journalists need in their work.