Looking on the internet deeply has found these results:

That's fine with me is the most popular phrase on the web.

That sounds fine with me 111,000 results on the web	That's fine with me 1460,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Well, that sounds fine to me, sir. Now that sounds fine, but it's added 100 kilograms to the weight. The theory might sound fine, but people aren't like that. That doesn't sound fine to me. Well, that sounds fine as long as interest rates stay where they are for at least three months. Now, that doesn't sound fine to me. Now that sounds fine but it's so bumpy in here, at low speeds particularly, that it's very difficult to get your finger to go in the right place. This sounds fine and I am sure the Member States will welcome that.	It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

That sounds fine with me

111,000 results on the web

That's fine with me

1460,000 results on the web

More popular!

Well, that sounds fine to me, sir.
Now that sounds fine, but it's added 100 kilograms to the weight.
The theory might sound fine, but people aren't like that.
That doesn't sound fine to me.
Well, that sounds fine as long as interest rates stay where they are for at least three months.
Now, that doesn't sound fine to me.
Now that sounds fine but it's so bumpy in here, at low speeds particularly, that it's very difficult to get your finger to go in the right place.
This sounds fine and I am sure the Member States will welcome that.

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.