I read it in the original French, and can't say I found much use for it.
No, it's not better in the original.
Everybody always raves on the "usefulness" of studium & punctum, but they are utterly arbitrary categories, and are not specific in any way to photographs. The punctum is a strictly subjective criterion, not a feature of a photograph, and the studium is just the rest. You could apply that same analysis to a painting.
I much prefer the films of Chris Marker when I need an articulate reflexion on the power of images, memory, and death. As for Barthes, his best work remains Mythologies because it precedes his obscure semiological period, is relatively light on pseudoscientific cogitations, and its generalizations still pass for insight, not decrees.