Did anyone actually win the War of the Pacific?

Was the War of the Pacific a conflict with only losers and bigger losers?

No. Chile was the clear strategic winner and won the war convincingly.

Chile won the war convincingly, so describing it as a contest between losers and larger losers obscures the strategic result. Peru lost its ocean-going ironclads, Chile gained uncontested naval dominance, and blockades let Chile control the campaign's tempo. Bolivia's privateering policy likewise failed to offset the absence of an effective navy. The conflict still imposed severe human and cultural costs despite its unambiguous strategic outcome.