EF 50mm f/1.4 or RF 50mm f/1.8 for R6 II?

[bosch91]

I just received my R6 Mark II yesterday, and after the hour or so I was able to get out and shoot with it last night, I am in love. I have the EF adapter since I currently own all EF glass (16-35 f/4, 24-105 f/4, 70-200 f/2.8, Sigma 24 f/1.4) and I'm looking for a fast prime in the ~50mm range for it. The RF 50 f/1.2 is out of my price range. Does anyone have experience with the EF 50mm f/1.4 adapted to RF? Mostly interested in AF speed and accuracy. I shoot a lot of low light so having the f/1.4 is intriguing to me, but if I can get better performance otherwise out of the RF 50mm I will go that direction and just bump the ISO.

[rs-eos]

The 2/3 extra stop could be very useful, but I'm thinking you may be better off picking up the inexpensive RF 50mm f/1.8 and then saving up for the RF 50mm f/1.2L version should you find you need maximum light-gathering.