I only have the A7. It depends on what remote you are using. If you are using the built in remote and an iphone and then you can only record .jpg to the phone as RAW would be too large a file. I have never used it.
If you are using the remote camera software downloaded from Sony via a USB connection then you can shoot Raw + jpg. Set your camera to menu> tool box 4 > USB connection > PC Remote. Raw + jpg is in the Quality setting on the remote.
Sony A7, A850, A77, A700 || Sony>> 70-300G, 28-75 f2.8 SAM, 16-80CZ, 50 f1.4, FE 28-70 OSS, FE 24-70CZ f4 OSS, LA-EA4 || Minolta>> 300 f4 G HS, 200 f2.8 G HS, 100 f2.8 (D) Macro, 50 f1.7, 28 f2.8, 28-135 f4-4.5, 70-210 f4, 500 f8 Reflex, TC x 1.4 HS, TC x 2 HS. || Sigma 21-35 f3.5-4.2. || Tamron SP 24-135.