Is there going to be a MK II of the EF 20mm f2.8 prime lens?

I quite like primes and have two, one of them being the 28mm f1.8 prime. As for the EF 20mm prime, some tests show it not to be very sharp in lab tests and zooms to be better. I was just wondering if anyone knows if Canon were going to make an EF 20mm prime MK II? 20mm on a full frame would probably be enough for me.