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dilbert said:Of course. So it is just a coincidence that it is both faster and better.
Not necessarily a coincidence, it's a case-by-case thing. But it is certainly not true that faster lenses are always better, nor are they considered to be so, even according to the all-knowing Internet. For example, it is pretty well acknowledged that the 70-200mm f/4L IS is sharper than the 70-200mm f/2.8L IS (and slightly sharper than the f/2.8 non-IS, despite the latter being a stop faster.
dilbert said:Yes, but the 135mm f/2L isn't an 85mm lens and therefore shouldn't be compared to it.
Why not? They're both "classic" portrait lenses, and in reality if you ignore perspective, only a couple of steps separate the angle of view at portrait distances. Plus, the 85L on APS-C is equivalent to the 135L on FF, and despite being slower and costing half as much, in that comparison the 135L wins, hands down.
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