It is also a very even illumination. The 21f1.8 has significantly lower vignetting than the Summilux 21f1.4. Edge distorion is very low (the Summilux might have less - but really not significantly so). Center sharpness is pretty much the same - with an edge to the Ultron.
This is at f1.8 and 0.5 or 0.6 m. Kanazawa, Japan September 2012. Kodak Ektar 100.
Check Flickr under tag "Voigtlander Ultron 21mm f1.8 Aspherica" - close to 210 shots up there now (mostly mine - but I had a head start with this lens).
There is a very detailed review/comparison of four 21mm focal length CV 21/1.8, Leica 21/1.4, Leica 21/3.4, and Zeiss 21/2.8, http://www.ronscheffler.com/techtalk/?page_id=130. I really enjoy Ron's write-up.
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