Sous vide cooking doesn't impart additional flavor. Your initial post was about ribeye, so it doesn't quite translate to filet....which is much leaner and needs a different approach.
First rule for any meat cooking is to season at least an hour before you start cooking. In your case, I would've thrown in butter and/or olive oil into the vacuum bag for a filet. It needs the fat & flavor. A filet is the mildest tasting cut of meat, so adding fat will help.
2.5 hours is appropriate. 140° is higher than I'd recommend for filet. Try 130° next time. But don't forget that the vacuum sealed pouch will carry all your flavor. Try butter, try rosemary, use a lot of pepper, and throw some garlic in there. But using the right amount of salt at least an hour before cooking will really change your life. Weigh the salt. Use up to 2% of the meat's weight as salt ( a 6 oz. filet will need 3g to 3.5g of salt)
But it sounds like you did just right out of the bag.