[Brightcolours]

they didn't learn from what happened to Canon when yongnuo launched their 50mm f1.8, and they were forced to release a 50mm f1.8 STM with an updated aperture.

I can see yongnuo 50mm f1.8 in sony mount coming and as I am seeing things, it would be easy to do a lens that will be even better than this one..

Canon were not forced to do anything by the crap Yongnuo produces, of course the new Canon was in the planning already for a long while. They have been updating the whole range gradually, as you might have seen.

The Yongnuo is quite a bit worse than the old EF 50mm f1.8 II, after all. 

 

Not sure why you think the new STM one consists of a new aperture. It has improved lens elements resulting in sharper images, it has improved more modern coatings, it has a new AF....