Yes, the H4 does seem a far superior choice, the H5 has a smear sensor and thus has a crop ratio of 1.3 according to the web.
I adore the standard lens (in 35mm terms a 50mm and I also love the 35mm semi-wide). Most of my other lenses no longer get used (coming to an eBay store near you soon).
In recent years I have become known for my off-camera flash shots (Sony Short List Professional Portraiture) and other work too, so this needs to be continued, the Leica has an Achilles Heel in that its fastest FS speed is 180th, when I would prefer 800th (for example) or so to make us of fast lenses.
The H4 all-told is the better camera for my own needs.
Thanks