The fastest 135mm lens currently on the market is made by ZY Optics, see below.
http://petapixel.com/2015/10/19/mitakon-speedmaster-135mm-f1-4-2999-gets-you-the-worlds-fastest-135mm/
That's an f1.4 lens, so 1.8 should be smaller, but still a substantial size.
http://petapixel.com/2015/10/19/mitakon-speedmaster-135mm-f1-4-2999-gets-you-the-worlds-fastest-135mm/
That's an f1.4 lens, so 1.8 should be smaller, but still a substantial size.
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