All non-diamond picks will mine obsidian faster than with no tool although every tool except diamond is supposed to be 4m10s,
most notable are gold, and iron.
Diamond pick can mine obsidian in 9.5 seconds
Gold pick can mine obsidian in 19.5 seconds
Iron pick.^ can mine obsidian in 38 seconds
Time is slightly rounded
Comments 2
Then the table on the wiki is wrong, and so is the article on digging.
Sounds logical to me. A pick is always better than bare hands.