so, consider the following conversation:
「まあ、it's sweet, for sake
Essentially I'm trying to say that something is not sweet in absolute terms, but is sweet relative to other members of the indicated category. Other examples might be "It's slow for a motorbike" or "It's gentle, for a roller coaster."
The best I could come up with was 「ほかの日本酒と比べたら、あまい」which gets the meaning across, but feels a bit clunky to me.