Was at Sony nex to try out the test unit. 70-200mm lens is on the test unit for u to try out the ibis.
Wasn't too keen so requested to try out on the dark setup for the 7s & switched to 35mm. Only using 1 hand to shoot to test out the ibis.
Below is my quick humble opinion since I only tested it for 10mins.
Oh mine, the grip is almost perfect with the c1 & c2 buttons nicely located. Feels like its tailor made for my hands! My only disgust is the movie button location.
1st few w partial lights, looking fine as ibis keeps the image sharp eventhough shutter speed is going below 1/20 & slower as I adjust the iso down. Not bad.
Next, is the extreme darkness test with very little or no light. Hmmm, with the iso 6400 (max I would push for a7 sensor) the shutter speed goes to 0.4 to 1s. This is where its loses out to the low light beast a7s. Images starts to be blurry..bare in mind I am using 1 hand, so in real world if we r using 2 hands it should be better. However, do note in real world the night scenery will look sharp but moving objects will be blurr.
Happy w the darkness test, I put on the 70-200mm for a few quick shots. AF seems faster & at 200mm zoom ibis does helps. IQ is good.
Now the question...to upgrade to a7ii or a7s (difference of 500+ as 7s price coming down) since I already using a7.
Between a7 & a7ii, mainly its the ibis diff. I am happy w a7 w/o ibis & have seen countless bro posting photos from a7, 7r looking super sharp. IMHO ibis is good to have but not a necessity.
As for a7s, it can do what no other cam can do for now. This makes my choice easy..buy a7s.
Don't get me wrong a7ii is very good cam but its boils down to what you want..for bros that are very very tight on budget a7 is a very good bargain right now, extra $ save can buy a fast & sharp lens like a 2nd hand FE55mm.