A couple of things I missed - Size/Weight & ergonomics/balance.
Well size and weight are slightly below the D800 - but it LOOKS and seems smaller in the hand - although it isn't really. In fact it is a pretty hefty unit.
Ergonomics and balance - as I said, the weight is very close to the D800 - so it is no surprise the weight balance works OK even with larger lenses like the 24-70 f2.8 lens. HOWEVER, as the grip is a lot smaller, if you are holding ONLY using the camera grip - it is much more stable on the D800 than the Df. For shooting purposes though, using one hand on body and one on lens - it is perfectly fine.
I can honestly say, as a guy with pretty chunky hands, I have not had any issue with holding this or feeling like I didn't have a good grip. The small integrated grip was not a hit with many people - as it was a clear departure from the old film cameras it was claimed to be modelled on. But it really helps with ergonomics.
Some people no doubt wish it offered a full battery grip option. Personally I do not use one with my D800 or any of my 'smaller' cameras. On something like the mirrorless OMD E-M5 I wanted the grip, as I felt it was too tough to hold onto without it.
You may also want to check out my recent post about the ISO performance of the Df vs the new D4s and the Canon 1Dx, here: http://www.mattgranger.com/gear-talk/item/564-d4s-image-quality-iso-still-short-of-the-df
DISCLAIMER - I have no formal relationship with Nikon - in fact I find them difficult to work with in a professional capacity. I bought my Df retail from Digidirect in Sydney - a great crew that I highly recommend. http://bit.ly/digidirect
If you are in USA, you can get it at Adorama: http://bit.ly/nikonDF Or at Amazon: http://bit.ly/NknDf
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