Considering today's 35 f/1.4 is already superlative...what, aside from the price tag, will be different with the new one?
The 35mm 1.4 was spectacular when it was released, now it's just average. It's so average in fact that a third party 35mm 1.4 Canon EF lens you can buy for $350 brand new is much better than Canon's own $1350 35mm 1.4, which is ridiculous:
Just from that comparison I see the following that could be noticably improved:
-Mid frame sharpness
-Severe Color Fringing
Here are some other factors which could be improved:
- Flare resistance (better coatings)
- mid frame and corner sharpness for meridonial detail stopped down
- Color fringing stopped down, it's plainly visible even at f/8.0
- Purple Fringing (I notice this in my copy)
Don't get me wrong even with all these problems the 35mm 1.4L is probably my favorite prime of all time ever, the combination of pleasing quality, focal length and aperture are amazing.
However if it were as good as say this, well... we can only dream.