At f8 your 50 f1.4 is sharper across the frame than the macro or the 135.
That well may be but I use my lenses most of the time wide open as I prefer short times to avoid camera shaking. And to realise short times when light is poor you need wide open lenses, no chance for f/8. Also the corners are of a lesser interest to me, therefore no need for small f-numbers. I want lenses that are sharp as sharp can be wide open (in the middle). The sharpest lens only at small f-numbers is of no use for me.
Just my Idea, Now past 2-3 years, The Camera are design so great at Low ISO up to 1600 with minimum noise, We do not need wide Opening of F. Stop any way, Except to get the total Back ground Blur, I use 2-3 stop above Total Open Wide F. stop of the Lens that I use ( If I use 85 mm 1.2 L II, I will use 1.8, or 2.0 in the dark area), and still get the best sharpest of the Lens in the dark area.
Just My Idea.
But I love to use F. stop at 1.2 ( by set up Canon at AV. mode, and ISO = 100) with Cir. PL, 4 ND, or 8 ND. Filter in the sunshine day and get rid of the unwanted Background. Please see the photos below.
Nice to talk to you.