[Thread] The shots taken with this lens are very very sharp, good contrast. I tried using F1.4 to F5.6 and they are sharp corner to corner with no vignetting. I don't find this lens heavy. The 24mm F1.4 is even heavier. I decided to get this lens rather then the 24mm cos I have a 21mm lens already. If you can find a stock for this lens, go get it. Never regret.

[0.15 lb] This is an expensive lens that represents top value. The optic quality and color rendition is amazing. Something about the 28mm focal length that I really Appreciate especially with this lens.
Magical!

[0.15 lb] Never used the Zeiss Otus, so cannot compare. Used for years the Zeiss 28mm 2.0 for Nikon, as well as the Leicas 28mm 2.0 and 2.8. This one is better by a very material and substantial margin, micro contrast, OOF with strong separation, very well built and with outstanding images over a large swath of images and field applications. Very heavy, very bulky and might not be adapted for all situations. Also extremely expensive.

[0.15 lb] Tack sharp, lightweight.

[0.15 lb] I’ve owned it for over a year and used it with my M10. The results are all that you’d expect from Leica optics. If you want wide and fast, this is it.

[49 mm] I just love this lens and leave it on 90% of the time- I do practice with it and that's vital- but the results are well worth it! Get this lens!!!

[Thread] This lens is amazing. No point buying an M and not having the right lenses Its not cheap but its Leica 100% you get what you pay for. I uploaded my my first Picture I took with the 21mm f/1.4 not a bad start I think.

[3 x 3 x 1.3"] There are only two 28mm that are this fast. This one is not big, but heavy. Haven't used Nikon 28mm 1.4D AF, but that one is probably even more heavier, and is autofocus as well as discontinued, thus no longer available. Leica 28mm Summilux is only 28mm 1.4 manual lens in the world.It costs almost $. Is it worth it? That depends on what and how you shoot. For me, if I have to shot with only one focal lens, that will be 28mm. Not 35mm, not 50mm, not 24mm. I am a professional photographer. This is what I do for a living, and if 28mm is the only lens I use, and if I can afford $, I really have no other option.Quality? Lets say it's Leica. For me, I want the best 28mm available in the world, and I want it to be manual focus, and Leica 28mm Summlux is where it all ends. It simply doesn't get better than this.

[Thread] I gave this lens 5 stars, optically it deserves it, this lens performs beautifully and balances nicely on any M body. It is sligtly heavier than most Leica lenses but small for a FF 21mm. Unfortunately Leica has handicapped this lens with regard to filters. The lens hood takes Series 8 filters, a drop-in filter that doesn't need threading but is otherwise a poor choice. Series 8 is difficult to find, except for uv/nd/pol. The solution according to Leica is an adapter that takes 82mm filters. Availability is greater than Series 8 but not readily available.The hood no longer works with the adapter in place subjecting the image to greater flare. Btw- the 82mm adapter can take 77mm filters without vignetting using a step down ring. Unfortunately filter use is only done with great difficulty and extra care is needed for the slightly protruding lens. So, why did I write so much about the filters and then rate the lens five stars? The lens is a phenomenal performer and well worth the extra effort.

[49 mm] I goofed in my previous review, saying the lens would not accept 49mm screw-in filters. The lens does -- but not as described in the instructions that come with the lens. It turns out there is -- unidentified in the manual -- a retaining ring which can be unscrewed and removed, which then exposes the 49mm female thread for screw-in filters.