[Arthur Macmillan]

I know it is a little annoying to point out 4x faster, but what I see is the hope that the achievements in lens design will lead to better designs in my native formats.  It wasn't that long ago that we had an EF 50mm F/1.  I suppose it was to expensive to produce as a practical matter.  But we are seeing a lot of very fast lenses coming out for APS-C and FF.  Not necessarily by Canon.  But the price and performance are breaking new ground.  You have to admire a lens design like this.  Even if the actual result might be a 50mm F/2...or F/4?  It doesn't diminish the cool design to me.