Godfrey, yes.
I found using the GXR together with the NEX 6s to be quite difficult actually. One reason, I suppose, is that I have not yet had time to set it up so that the buttons are roughly in the same place. And even using the 1 to 1 ratio, 28 mm is still too wide a focal length for me. And that particular module can only focus down to 20 cm.
I actually had one of the new Fuji 100s cameras on order but the financial controller got quite upset about the spectre of me buying yet another camera. I imagine some readers here have had similar experiences! And in truth the 35mm focal length is not ideal for me either, as I recall from the Fuji 100 I had a year or so ago. For now I am going to persist with the 30/2.8 Sigma on the NEX 6 when I need a still camera. The new 60/2.8 should arrive this week to end that really will be a complete set up.
The only reason I wanted another camera in addition to the pair of NEX sixes was simply to have a personal camera set up only for stills and to carry it with me everywhere. The cameraman that I work with on making our products has become interested in the NEX 6 and we're thinking of selling our HMC 152s as a result. This is not a video forum so I will not go on, but my gear buying and selling over this last year has been about the (perhaps impossible) quest of finding two cameras that can be used in a two-camera video situation AND be a decent stills camera.