These three cameras are as close as peas in a pod: they have similar zoom ranges, similar specifications, similar prices and similar scores. There is really very little to separate them in terms of performance.
The Pentax MX-1 and the Fujifilm XF1 both achieved 49 in the overall DxO Mark score, over the 48 of the EX2F. The best choice out of these three is going to come down to which has the features that most interest you or possibly which you like the look of.
The Nikon Coolpix P7700 scores a full 5 points better than the EX2F, it has 1.1bits more color depth. The Canon Powershot S110 also has more color depth, 0.6 bits, though it fails to match either the Samsung or the Nikon for low light with a score of 168 ISO. The biggest surprise is just how close together these three are in price.
The deciding factor here is what you want to get out of your camera: if you want selective focus or are keen to be able to share your images immediately the Samsung fulfils the brief well, but the Nikon, especially of these three, with its greater zoom range and superior color appears to be a very worthy competitor.