I have a 2012 Felt F95 (as shown at: http://www.wiggle.co.uk/felt-f95-2012/) and I wanted to upgrade the brakes to Shimano Ultegras. I was wondering if these are compatible together.
I believe all drop-bar road bike brake levers designed for caliper brakes use the same cable pull ratio, so yes you can fit Ultegra calipers.
Personal opinion follows ...
I'm not a fan of installing individual components of a level many steps up from the rest of the components on a bike. You may not see the full performance benefits of the high-level calipers because the lower level Microshift levers will be the limiting factor.
The Felt F95 has no-brand calipers I believe (at least the 2017 does, your link to Wiggle does not work), so even Claris or Sora level are going to be better. You may as well save a little money.