Var.: Всякий цыган свою кобылу хвалит. Всяк своё хвалит
Cf: A dealer in rubbish sounds the praise of rubbish (Am.). Each priest praises his own relics (Br.). Every cook praises his own broth (Am., Br.). Every pedlar praises his needles (Br.)Русско-английский словарь пословиц и поговорок. Академик.ру. 2013.