Yep I am doing just that, I am selling the lens that served me very reliably since 2005, after 12 years of heavy use, it needed AF motor repair twice and now her AF locks slightly at one meter focus and needs a slight push otherwise perfect condition, to buy a new one.
Of course I am mentioning the issue to the buyer.
Your definition of "otherwise perfect condition" of a battered and heavily used lens is, hmmm, interesting. But in Lebanon maybe no problem. Looking back to 12 years with two repairs, you want to get the next 2 repairs? Cool. Do so.
Canon 50mm f1.4 has a micromotor autofocus, it's known to fail frequently and the two repairs were actually AF motor replacement, but yes I will be very frank to the buyer and selling for less than 50% of price brand new, so it should be some good deal to someone
I am a little confused... if this lens model has a known issue, why even consider it not for the first, but for the second time?
A Sigma 50/1.4 EX may be a better choice, let alone one of the modern units (Sigma 50/1.4 A, Tamron 45/1.8...)
Or even Canon EF 50mm f1.8 STM
You might call it winning team, I would not trust a lens which apparently calls for troubles. And I can imagine vividly your thread headline "lens broken, tomorrow important portrait/wedding session - what now?" But then, it's your nerves, not mine. And I would change a "winning team" because in your case it's no team - it's just a lens, you don't need a certain camera to get that pictures, each Canon APS will do.