同どう日じつの談だんではない

expression, i-adjective

cannot be compared; not in the same league

Idiomatic expression meaning two things are so different they cannot be compared. Literally 'not a same-day discussion'. Used to emphasize a vast gap in quality, ability, or scale.

• 彼かれの実じつ力りょくは私わたしとは同どう日じつの談だんではない。

  His ability is not to be compared with mine.

• この新しん製せい品ひんの性せい能のうは旧きゅうモデルとは同どう日じつの談だんではない。

  The performance of this new product is in a completely different league from the old model.