In comparison to the branded 50/1.4, it performs better in terms of build quality, sharpness, and autofocus (AF), but it has a worse overall aesthetic. Look elsewhere if you value sketching highly but wish to make the jump from manual to AF. Better to spend your money on something more modern than a 50/1,8 II against STM - a sew on soap. Perhaps a different kind of enlightenment causes those who create "plaster-fiction" to draw more gently. 40stm vs. 50stm - strangely, both offer about the same picture (in terms of color and blur, but not in terms of FR), 40mm can be recommended for crop for everyday, given that this fifty kopeck piece is of little use for the role of a portrait lens exactly according to the sketch. But don't be deceived by the "angle of the human eye;" you'll need at least 43mm for FF to capture that much of a difference (and for crop, normally 32mm; after that, forget about the volume and portraits). My advice is to start with a dandelion, invest in a Tamron or Sigma lens, or purchase a branded "warm lamp" 50/1,4 with a disposable helicoid and an odd motor.
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