Originally posted by hadi the sigma 135 1.8 or the canon 135 2 is the reason i'm planning on picking up an A7II or A7RII. Since there is no reasonable options for Pentax, aside from the rokinon manual focus, the Sony lineup is getting more and more attractive.
the price at $2000 USD is a little high, but i also know what this lens is capable of, so perhaps its worth it?
What are you going to do that will make you $2000 that you wouldn't have if you didn't use this lens?
As one who bought a DA* 55 1.4 instead of the new DFA 50 1.4, because I thought it was much better value, considering the images are only slightly different, I'd answer certainly not. Someone who bought the DFA 1.4 will have different opinion.
But, for me, I can't afford to buy a pile of lenses of that quality. I have to be selective. A lens like the DA*55 1.4 is in a focal length I know I will use. Over my whole 60 years of photography, 55mm has probably been my most used focal length, so I'm really familiar with it and am happy using it. So I decided to splurge for a lens that cost me $500 CAD or $400 USD.
SO, if you you have the money and it's a lens you're likely to use, it might be worth it to you. If you don't use 135mm much, and I only use 135mm in zooms, and even then fairly rarely and on occasions where I'd really like longer but don't have a longer lens handy, it would be a complete waste of money. I wouldn't take it anywhere, I wouldn't use it anywhere.
So bottom line, it's completely up to you.
Two considerations...
Is there anything else you could use the money for that you'd enjoy more (and I can think of a lot of things I could use $2000 USD for.)
And what percentage of the time will it be on the camera?
If you use a lens for 10 years and make good use of it... $2000 is $200 year. If you use it 10 times per year that is $20 per use. If you use it 200 times year that's $1 per use. So you tell me, is it worth it? It's all about you.