I believe you're the one cherry picking models here... Things were a bit different in the early days when things were advancing & changing faster. Looking from around the A7iii onwards, once Sony made big breakthroughs in AF and sensor design, things dropped into a pretty regular ~4 year cycle for most models, and the gap from the A7Sii to the A7Siii was 5 years, somewhat balancing out the shorter time from the A7S to the A7Sii.Do they? I suppose, if you cherry pick the less popular lines. There have been 15 a7-series models in the past 10 years. 5 of them have been a7R models, averaging a 2-year cycle. The others generally average a ~3 year cycle. The a7S II came out 18 months after the original.
One exception is the A7R series where Sony has been pushing the limits with sensors & other tech much more, that has been on more of a ~3 year release cycle. The current model is very impressive and Canon has their work cut out to match it with the R5ii, assuming the R5 series is going to carry the "high resolution body" banner for Canon going forward.
Anyway, overall Sony's release cycle isn't so different from Canon's or Nikon's.
Hope Canon does the R1 right, someone needs to seriously challenge Sony on the high end with a camera that isn't just using mostly Sony internals (aka Nikon).
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