Yup, agreed. Had the Zeiss 25 f/2.8, and it was a lovely lens, comparable in signature, size, and IQ to the Elmarit 24 mm f/2.8. However, the 24 Summilux is a whole different beast. I am in love with the lens. It is a true wide, with the ability to creatively control depth of focus. Stopped down, it becomes very sharp, yet has a less clinical signature than the Zeiss 25 (there's something organic about the signature, and I hate to talk in vague terms, but it's thre)....
I wholeheartedly recommend the 24 lux, if the price is not too much for your wallet and given that you enjoy the wide perspective. It's as wide as I typically go with my M9, and I am very happy with it. I suspect that it will be a lifetime lens for me...
Here are a couple of random examples:
Best,
Ashwin