Very nice review, and really nice to see the extended discussion at the end of the video review. I've not used my 50mm f/1.8 STM much yet since at 50mm I've been more interested in getting time with the Sigma ART, but sometimes I will need a smaller lens. I too will be interested to see if Canon produces a 50mm f/2 or updated 50mm f/1.4 sooner rather than later. I feel they might wait having released the STM f/1.8; they may have other priorities now, but maybe they will wrap up this overhall of their shorter primes with an update to the f/1.4 as well. Maybe they will release it with the 5D mk IV.