Maximilian said:AFAIK STM has the following features compared to (ring) USM:
+ cheaper
+ silent
- slower
- less accurate
- less increments/steps per rotation
Being silent is THE feature for video.
But main feature for Canon is CHEAPER.
This lens would be aimed at wildlife and sports photographers. So I cannot believe they would go with STM instead of USM to save cost if, as you say, STM autofocus is less accurate. Autofocus accuracy would be the key feature and key selling point over Sigma or Tamron 150-600. Well at least one of two selling points, other being sharpness.
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