[Idiom] As fit as a fiddle/In fine fettle

[Barman]

1) We returned only the day before yesterday and everybody is as fit as a fiddle.

2) We returned only the day before yesterday and everybody is in the fine fettle.

Of the above sentences, which one is more idiomatic and natural?

 

[Rover_KE]

1) We returned only the day before yesterday and everybody is as fit as a fiddle.

2) We returned only the day before yesterday and everybody is in [STRIKE]the[/STRIKE] fine fettle.

Of the above sentences, which one is more idiomatic and natural?

With that correction, they're both idiomatic and equally natural.