poor range of dedicated Sony lenses and these are all generally very large, heavy and expensive
camera is ergonomically too small and uncomfortable to hold for the larger full frame lenses
native (best sensor image quality) ISO is at ISO 100
despite some loose claims by Sony about dust and moisture sealing, the a7II does not seem to be truly weathersealed
1)relatively poor battery life compared with dSLRs
sensor based
image stabiliser only 2-3EV which is apparently due to the physical design of the lens mount diameter
limited functionality when using other mount lenses eg. may not have Eye AF, and AF speed is not as fast
AF-C is not great
Eye detect AF requires an EXTRA button press to temporarily activate it - unlike Olympus which will automatically try to achieve eye detect AF if enabled
PDAF sites are clustered in the central zone too much
CDAF mode does not work well with lenses not designed for CDAF (eg. most Canon EF lenses)
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not supplied with an external battery charger - you need to buy one of these extra
need to apply the firmware update to get uncompressed RAW file mode - but these files are enormous at 48Mb!
compressed RAW file mode has artefacts you cannot easily fix in post
really loud shutter and no silent shutter mode
rear screen is not touch sensitive and does not swivel
EVF looks blurry even after adjusting the diopter - just not as easy to judge focus compared to Olympus OM-D cameras
switching from back button AF to half shutter AF modes requires diving into the menu system
no button to switch from EVF to screen manually - must dive into the clunky menu system
Auto Review is too long and thus dysfunctional
menu system does not have context sensitive help option to explain what each item does
menu system needs overhaul to make it more user friendly
Scene mode is chosen only by an icon with no explanation of what it is
navigating through the menu system is cumbersome as too easy to rotate dial instead of activating it as a button - very different effect on menu navigation
issues with video quality
no HI/LO spot metering mode to allow metering on brightest or darkest part of scene as with Olympus cameras
autoISO only allows a ISO range to be set and will raise ISO to keep shutter speed at least as fast as 1/focal length even though image stabilisation is in use
no built-in intervalometer - need to purchase a Playmemories app - and by all accounts it is not great - if you live in the right region to be able to purchase it!
when tethered via USB sony cameras will not allow images to save to the memory card of the camera
AF accuracy issues with some lenses and it appears it may try to achieve AF at the stopped down diaphragm corresponding to selected aperture on Sony lenses which may present issues in studio work
2)