Agreed, I don’t know how you’d constructively call the RF 50/1.8 ‘just horrible’. It’s pretty good at f/1.8 and stellar across the frame, corner to corner, after that. It is very light weight, and so inevitable feels somewhat ‘cheap’, (yet strangely the EF 40/2.8 doesn’t - odd) and thanks to the aspherical update to a ‘60s optical design the bokeh can get harsh under certain conditions, sometimes, but most of the time you ain’t going to tell the images from this apart from those taken on an expensive lens. The plastic moulded aspherical element seems very efficient at keeping a sharp image across the frame, and the STM focusing is fast enough surely ?I'm surprised 1) to hear you think the RF50/1.8 is "just horrible" or that 2) you think an RF50/1.4 would be either better (if a double Gaussian design) or smaller than the Sigma (if a modern high-sharpness design).
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