Yes, I hate that ugly bayonet too, while I love it on the steel-rim Summilux.
The most beautiful looking Voigtländers LTM are: Color Skopar 50mm f/2.5 in black paint (rivals the painted Leica lenses), the Color Skopar 28mm f/3.5 in black paint (also extremely beautiful) and the Ultron 35mm f/1.7 aspherical in black paint. The name ring of this lens is as ugly as can be, but you can remove the red paint from the "ASPHERICAL" word and repaint this and the other words with a smooth gray color. Looks much better then.
Erik.