Previous generation Shimano 11 speed front derailleurs needed a daft amount of force to get them moving, especially if the cable routing is wrong (there are two clamp positions depending on cable entry angle).
I would try changing the cable clamp to the alternate position. It's unlikely that the bike was supplied with it in the wrong position, but there is nothing to lose by trying. Shimano sell a tool for determining the correct alignment, but there seems little point in buying it in this situation: just try the other position and see if it's any better.
NB From the little that I've read, setting up and adjusting the new 11 speed Shimano front derailleurs is not as straightforward as traditional front derailleurs, so before releasing the front cable to try the alternate cable clamp position, read up first on how to set up and adjust the front derailleur, so that you know what you are doing, e.g. read the relevant Shimano dealer's manual.
