My motivation for purchasing this lens is I have been a 'mostly prime' shooter for sometime, having only one zoom here or there. I rarely shoot anything wider than 24 and longer than 240mm. I have owned many variations of 24-70 lenses and have found the FL's over 40 (I love my pancake) and less than 85 do nothing for me. Add to that the various 24 and 35 primes on the market, I was seeking IQ and distortion values found in lenses I simply could not afford, i.e. Canon 35 1.4L ll and the 24 L. This lens was the best compromise I could possibly make, giving me both FL's and everything in between at a quality level I found to be far higher than any two primes I could get at under $900 (combined). I have used or borrowed the Canon non L IS 24/35 Primes and have owned a Sigma 35 Art in the past and I am convinced the 24-35 outperforms the IS variants and is nearly on par with the 35 Art. Your review helped solidify my decision Dustin. Thank you. I couldn't be happier.