I bypassed the Sigma for the Better RF 135L f1.8
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I borrowed a friend's Sigma for two weeks, and I thought it was a fantastic lens, and it was the best 135mm ever, maybe 2nd to the Sony. But this is no longer the case with the advent of the RF.
Now that I have the RF 135L f1.8, I find that the RF renders better than the Sigma, and I consider the Sigma a very good lens.
The RF has better build quality too because if you drop both, the RF is more likely to bounce and the plastic flexes more than metal causing the plastic RF to better absorb shocks, and being lighter, dropping the RF will hit less hard than the Sigma.
The RF focuses faster too, although to be fair, the Sigma will never be accused of focusing too slowly.
The RF is smaller than the Sigma when mounted, and feels less heavy at the end of the lens. And of course, no need to adapt the RF.
Both lenses provide wonderful bokeh.
The RF has IS, which the Sigma lacks. The RF is moisture/dustproof and I think the Sigma is too?
It comes down to this: If you have the $ and are willing to spend it, then the RF is the better lens and is the way to go, otherwise the Sigma would be a fantastic choice too, but it is the lesser of the two.
These lenses are often the kind one buys a few times in their lifetime, so if you compare the cost over a lifetime, paying $1,000+ more for the RF is insignificant, at least to me. I replaced my EF 135L f2 which I bought decades ago, so I expect to keep my RF 135L for decades more, for sure until I pass away, so $1,000 over the rest of my life is not worth worrying about if it means you get the better lens.
So buyer, get either and you will be happy.
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