View CSS Style sheets in IE11 F12 Developer tools

I don't believe so. There is a Connect issue reporting this and MS says they have it on their backlog for a "potential" future release. IE11: CSS tab missing in new F12 Developer Tools

Update: Microsoft has announced via the UserVoice site for Internet Explorer that they are planning on bringing it back.

The CSS tab is missing, and the debugger does not list CSS files either.

However, If you find an element in the dom explorer with styles applied from a css file, you can then click on the file name and open the entire file.