(and I have Canon's 50/1.4, which while as ancient of a design as any of the planars, both works very well on my 6D and is stupid sharp when stopped down versus all competition except the 50 Art and Otus in the mount, with AF)
Oh, there are a couple of 50's that are sharper, and with far better micro-contrast than Canon's. Canon really needs to update their 50/1.4.
Sure, but none with AF on Canon EF-mount, or on Nikon, or Sony, or Pentax... They're all ancient designs, and perhaps Nikon is the worst offender; they re-sleeved their old 50/1.4 formula into a new 'G' body, but didn't really upgrade the optics, like Canon, except that Nikon's transition is much more recent; same with their 50/1.8G. So they have lenses that are optically equivalent to Canon's ancient designs with upgraded built quality- woohoo!
For Canon's part (and unlike Nikon), a 50/1.8 IS USM has been on the rumor mill for some time; it may or may not be real, but given the advances that Canon has been able to make with their current trio of stabilized primes, like the 35/2 IS which is a true next-gen design unlike Nikon's 'has been' 35/1.8G update, it's not hard to believe that Canon is seriously willing to keep pushing forward.
If only they'd apply similar resources to upgrading their sensors, or to bribing Sony for some Exmors.