Originally Posted by
Jamminatrix
4700 uses the "new" geometry front derailleur, so you can use the 5800 front derailleur on 4700 shifters...however 11 and 10 speed rear are different cable pull/geometry, so you cannot mix the 4700/5800 rear shifter/derailleur.
As for your comment about "shifters seem to take a fair amount of effort", this is a sign of worn/old/dirty cables. Shifters with higher mileage just get 'sloppy', but they should not get 'heavier' in action.
You guys are aware than next gen tiagra has a redesigned cable pull. It's longer, and the rear derailer looks an awful lot like a 5800, it has the terrible exit angle and everything.