Size is relative. It is huge for a rangefinder lens but smaller than many SLR lenses. However, I don't call this lens The Beast for nothing. I love mine. I also have a 35mm Summicron-ASPH which is much smaller. Normally, I use the Nokton in the evening or when I know for sure that I will be shooting in low light. Otherwise, I use the Summicron-ASPH.
I combined my Nokton with a Bessa-T body. The lens does feel a bit chunky on my Leicas but on the extremely light Bessa-T, it is beautifully balanced. I have no doubt that this body was made to match the lens. I, along with many others, complained about the position of the strap lugs on this camera causing the lenses to point upwards when the camera is hanging from the shoulder or around the neck. You wouldn't believe how much this bothered me. However, when I mated the Nokton to the Bessa-T for the first time, it all made sense. With the Nokton mounted, the strap-lugs were in the perfect position to keep the camera perfectly balanced. The Nokton with the Bessa-T and 35mm Brightline VF is one sweet kit. The 1.5x rangefinder helps when focusing this fast lens in low light too. I don't think I'll ever take this lens off of the Bessa-T now.
To be quite honest, the size and weight of this lens would probably bother me a lot if I was to use it on a Leica body for an extended period of time.
I also like the fact that this lens allows me to play with shallow DOF with a wide-angle. One can't complain about the bokeh on this baby either.
Some of my photos taken with The Beast:
BTW, I added vignetting on the last two. There is some vignetting wide open but nothing like that.