I had the EF 135mm f/2 and my RF 135mm f/1.8 is superior in nearly every way: image quality, AF speed, optical IS, ergonomics, build quality, weather sealing, shorter MFD, 1/3 stop faster (37% more light), better bokeh.The problem Canon had with the rf 135mm, is that the ef version was / is so strong. Sure the new lens is sharper, gains 1/3 stop in brightness and an image stabiliser. However, it’s larger and heavier. Plus is very expensive, you really have to want one to justify the rf version over the ef version. The EF version puts out really great images that are very similar to the rf version. For a lot of users who already have the ef version, there’s not a particularly strong enough reason to upgrade.
Weight is heavier but if you're using the EF-RF adapter(110gm) the difference is only 75gm.
The old lens is still a great lens and good value but depends if you want (and can afford) the best
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