Now this is one heck of a lens. I think that statement says it all. As can be expected from a Leica lens build quality is second to none and is quite heavy in the hand. It does make the A7 system a little front heavy when holding, but it's not impossible to handle. One of the best things about this lens is the built-in hood which you just pull forward to use. That together with a max aperture of f2.8 makes this lens a dream to use, especially on a full frame sensor. I'm certain this will be one of my most used lenses in the near future.
I've been reading some comments on the Internet forums lately from users who swear they will never buy a manual focus lens. Well, for me, it is slower and is nothing for anything that is on the move but it's all about the fun and slowing down to get exactly what you want int he frame. It's all about the fun of it. I will admit that I have many AF lenses and I do prefer them at certain times, but for my general walks etc I'll always take a manual focus lens or two with me.