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That lens will be a dream. Does it have stabilisation? Unfamiliar with the Canon line up.

No stabilization, it was released in 1996 and still hugely popular today, super sharp even at 2.0. Portraits and low light are it main strengths.

Seems similar to this beast: https://www.kenrockwell.com/nikon/135mm-f2-dc.htm

I've got the 105 version, its amazing. 135 would get you even more buttery backgrounds.

Yeah that’s it, Nikon and canon are the two giant in the arena. I also heard Sony have just released a 135 that is the best. (For a price obviously)

Yeah, the Sony variant is an absolute monster. Super dooper sharp, but it weighs about 4 station wagons, even for a mirrorless lens.