Sony has just announced the A5100 compact mirrorless camera. which takes the ‘guts’ from the a6000 and puts it into the compact body inherited from the NEX-5 line. The a5100 offers the same 24.3MP sensor with on-chip phase detection as the a6000, along with a 3″ LCD that flips up 180 degrees for taking self-portraits. The a5100 has impressive video features for its price, including support for the XAVC S codec, which allows for 1080/60p/24p recording at 50Mbps.
dpreview has posted high ISO comparison of Sony A7S, Nikon D4S, Nikon Df, and Canon EOS 6D. All these cameras has very good high ISO performance. The Sony A7S and Nikon D4S have the highest ISO range at 409600.