I was lazy, and put it in an engine.
After 10 seconds Stockfish gives +77.8 for white
5)...g5 doesnt look too credible. I am no endgame expert but I would play 5)...Ke6
I recently had a similar end game from the Black side and lost.
77.8? How is that possible??
lim x→+∞ , not +78.
Most 2 vs 1, 3vs2 and 4vs3 positions with connected pawns in opposition to each other and not in locked formations, and the Kings in the general vicinity of their pawns, are wins for the strong side.