Yes, the hood from the 35 Summilux works fine, and doesn't vignette with film either. For the M8 you can also use a 46mm filter ring (filter without glass) as a very short 'hood' which will keep dirt and fingers at a little distance, and is very compact.
Regarding the focus shift; I too did a test for focus shift after I noticed it on some M8 shots. The CV 28/2, and even more so the 35/1.4 definitely show focus shift on digital, and it is large enough to be a problem. The 28/2 unfortunately also has soft corners, and in general I prefer the older 28/1.9. The newer lens is built better and a bit smaller, I think, and has less flare, but in other regards I like the older one better. The Summicron is better overall than either, but whether the difference is worth the price difference is of course an individual decision.
On film I also found the focus shift of the 28/2 to be rather insignificant, but not that of the 35/1.4. I still have the latter, and use it regularly, but I usually use it wide open or at 5.6 and higher.
To the poster that said that someone always criticizes the CV lenses as soon as they come out and must be in the pay of someone else; that is utter nonesense. All lenses get examined, tested and criticized when they come out. It's just that CV lenses, even though they are very much cheaper than Leica lenses inevitably get compared to them, and strangely enough CV doesn't go to the same lengths in design and manufacturing as Leica. Who knew??? CV lenses are great value compared with Leica, and are often truly outstanding lenses compared with Canon, Nikon, Sony and other brands in their price range, but their faults will be exposed, and in the end all lenses have faults.
Testing lets you know about the faults, and lets you use your lenses to best advantage. If you know a fault, you can work around it, ignore it or use it to your benefit, depending on the occasion. All are valid, but it's good to know what you are dealing with.
Henning
