YosemiteJunkie wrote in post #2522789
The 1.4 has USM and the 1.8 don't. So.... It's gonna be faster focusing (and more accurate)
Its not USM, its micro USM, there is a difference.
Nevertheless, its still a more accurate focusing lens than 50mm 1.8
I still plan on upgrading my 1.8 to the 1.4 version of this lens. From what i see and read it does not seem like its a faster focusing lens, and can have problems focusing in low light (compared to the 85mm 1.8 lens)
Id buy the 50 1.4 sooner but im too busy blowing cash on other lenses
At the end of the day, the 1.4 is better than the 1.8, and in many ways.
Build, mount, focusing, speed, IQ, ...