Nex F3 - Low ISO reading and Interpretation.

[ttan98]

Hi,

I am referring to DXOmark's review of the new NEX F3 camera, one of the comments is:

NEX-F3’s weakest sensor quality is its uninspiring performance in low light. It reached an ISO threshold of about 1115, after which its image quality began to deteriorate.

Low light ISO readings from NEX 6 and 5n are 1018 and 1079 respectively and these 2 cameras are well known for their low ISO performance and Nex F3 has even higher ISO reading, 1115. Why did DXOmark is able to put out a comment as above. I don't understand, please explain.