20 fps with 24MP sensor
fully silent, vibration-free operation
5-axis in-body IS
693 AF points
2.2X bigger battery than A7-series
dual UHS-II SD slots
among other new features
$4500, priced just above the 5D4 and well below the 1DX2
dubious weathersealing. the ports certainly don't appear sealed at all.
dubious support. they will finally have walk in centers. will they have parts?
no telephotos or pro lens over 200mm really unless you think a 100-400 3.5-5.6 is it)
fully electronic shutter for most shooting modes only 5fps if you use an actual mechanical shutter. light fllicker, fast action - who knows what kind of influence that will have.
still a small fiddly ergonomic nightmare. can you see pros with thick heavy gloves at the side of superbowl shooting with this?
ps .. the 1DX Mark II is 16 fps - and is built like a brick and built to survive rough environments. the D5 is a completely awesome machine as well. no one is going to give up those two machines for an A9.
the EVF was very cool though. you really couldn't tell you were shooting unless you looked at the shot counter.
also how well will this perform with long fast lenses in dimmer light? major defocus and low contrast AF has been very hard on the A7 series cameras. anything over 85mm in dim light can be a no-go.
also - if this is entirely with E-shutter, that means you are always shooting stopped down. need more DOF? well, too bad, you'll take an AF hit.
Trusting sony specs always is a losing bet.