Hasn't Mrs Brown been around longer than Partridge though? I think you'll find her creation has been around at least 30 years, spawning one Hollywood movie before these current incarnations. He's tweaked it loads over the years but O'Carroll created her, invested in the stage productions and deserves her huge success now. It hasn't just appeared overnight, he's grafted years to get it where it is.
Whereas Coogan got given his TV sitcom just months after creating him on radio. I really don't think Coogan's been hard done by with AP. If more people go to watch MBB at the cinema, it's because MBB appeals to them more than AP. O'Carroll wanted that, he's an unashamed populist.
And O'Carroll is a genuinely funny bloke, have you seen him on interviews? He's as smart as any Coogan, Gervais or Pegg, your cool crowd of writer. Good luck to him.