Never tried the pre-aspherical lens, but I believe they were famous for producing outlandish coma. The lens is very small.
The Aspherical ( as opposed to the ASPH ) was a limited run edition with corresponding price tag.
The current ASPH was the first lens I every bought new : it was really ground breaking in it's performance.
Wide open the coma is virtually insignificant; the image sharp and flare is well controlled ( in indoor lighting situations ).
It's down sides is reportedly focus shift of the M8/M9 - but I've not seen this as I only have film cameras.
It's also not really a lens for shooting into the sun or extremely bright sources against a dark foreground - that will produce frame filling internal reflections.
(the white and blue streak on the RHS is the comet Hale-Bopp)