Macbook Pro Retina 15" (late 2013), is it possible to run 1 extra display at 60hz in a best resolution than full hd?
According to EveryMac.com 

"This model supports a simultaneous maximum resolution up to 2560x1600 on two external displays via Thunderbolt. Alternately, it can support a single display up to 2560x1600 via Thunderbolt and a single 1080p display at up to 60 Hz, 3840x2160 at 30 Hz, or 4096x2160 at 24 Hz via HDMI."

EveryMac is your friend when it comes to Mac details and specs. I find it better (often) than the official Apple support site.