I don't know what ESL means.
the greatest writer of songs after Schubert
Isn't the line usually 'after Schumann'?
That would mean the line "usually" goes "Wolf is the greatest writer of songs after Schumann". Im sorry you have no disregard for lexical continuity.
Response: 'Don't you think Wolf is the greatest songwriter after Schumann, because Wolf is not greater than Schumann?'
This does not follow from the previous two posts. Again sorry you don't care for linear logic.
much more so than Mahler, Reger or Eisler.
Respectable opinion, but the kind of people who bring him up when discussing lieder as an "obvious pick" are probably also going to bring up Brahms, which is nowhere near an immediate candidate for a shortlist of greatest lied writers. Point being:
It's always Schubert, Wolf, Mahler, Reger, and Eisler