You can't have your cake and eat it...
The designers either go for a creamy, dreamy (read soft) look wide open or they go for a sharp look.
You can always make a sharp lens soft (vaseline) but you cannot go the other way
Personally, I think bokeh is way overrated and the majority of Canon's old lenses are not sharp enough.
Kudos for Sigma for taking it in the right direction.
BTW, I sold my 50 F/1.2 because it was too soft wide open and I've had and returned two samples of the Sigma because it has focus inconsistencies and it was no sharper than my 24-70 F/2.8 II @ F/2.8.
I'll wait for the Canon 35 F/2 IS to drop $200 like the 24 and 28 did or get the 35 F/1.4L II if it ever materializes.
I'm shooting a Leica Summicron 50 F/2 on a Leica MP film body at the moment and really enjoying the experience...