What should I expect from Canon EF 24-70mm f/2.8L II USM?
I'm a noobie around here so I hope I don't annoy too many of you with this question.
At the moment I have a Canon EOS 80D and the Canon EF-S 18-135mm f/3.5-5.6 IS USM Lens. I mostly use the camera for travel and street photography so I thought I should probably get a better zoom lens that would also allow me to move to a full frame in the future. So I decided that I'll go for a 24-70mm f2.8. (I know, perhaps not the best focal length on a cropped sensor for what I want) Between Canon, Sigma and Tamron people seem to praise Canon a lot so I decided to ake a big investment in the Canon EF 24-70mm f/2.8L II USM.
I've only had it for a short time, so I can't say I've tested it comprehensively, but I must say that so far I'm not impressed. Given that people (our of which many are professional photographers) are so happy with the lens, that must only mean I'm doing something wrong.
What should my expectations be from Canon EF 24-70mm f/2.8L II USM compared to my existing EF-S 18-135mm f/3.5-5.6 IS USM? I realise that the price - image quality it's an exponential relationship, I was thinking that between two side by side photos I could pick the one L lens took in a heartbeat which is not always the case. (I also realise that L lens brings it other things which won't necesarily improve image quality like weather sealing and wider aperture)
Given that the differences are not that noticeable, would it be worth for me to get instead the Tamron or Sigma which are cheaper, have IS and are still very good lens?
Later edit: Here are some samples (in Canon RAW).
24mm, 1/20s, f/9.0, ISO 100
24mm, 1/60s, f/5.6, ISO 100
This is a crop from the f/5.6 sample at 200% zoom. Yes, there is some chromatic aberration and more distortion and maybe not as sharp image quality but is this the difference I should expected between a very expensive pro lens (right) vs a kit lens (left)?