According to http://www.oneworld.com/ffp/lounge-access/, yes, provided that the CX lounge is open at that time and does not have capacity issue.
Since this is a very special case, I would suggest you to bring a copy of the above-mentioned page with you.

A few photos of the lounge are here

I was not aware that a new lounge was being built but headed over here anyway as it's closer to my BA gate than the Admirals Club. All I can say is WOW!

I've got a great view of SV, EK, AF, AA, VN, CX and BA aircraft from my Solus chair with a glass of champagne.

^^

Writing from the lounge. Truly nice, and even magnificent compared to the previous one. They even have a true noodle bar with selection of wonton, dan dan noodles and pho.
Sad there is no F class lounge, just biz.

Going to be in CDG next week. Just to confirm 100%, can BA Silver(OW Sapphire) flying economy on BA use this lounge and bring in one guest?

Absolutely - oneworld rules!

This lounge is really good and the catering quality is also good especially the French desserts. Made to order noodles and pho. Also some hot dishes

An excellent lounge. Don't forget the chicken curry, ala thai style, was great too!

Picture Reviews
 

Hey guys,


I have actually taken an extensive amount of pictures of this lounge, both the facilities and food offerings, for those who might be interested.

LOUNGE FACILITIES

FOOD/BEVERAGE OFFERINGS

Though the posts themselves are not in English, but they are picture-oriented so hope you can enjoy them! ;)

cheers

I have just used the CX Lounge at CDG and must say I am very impressed! The lounge is beautiful, has everything you need (champagne, noodle bar, good food selection) and a calm atmosphere.

It also has great runway views - perfect!

Going to try the AA lounge which is right next door - just to compare of course :) The AA one had a very poor choice of food and drinks and did not have the same calm atmosphere as CX!

aks120

Agreed, this is a very well designed, comfortable and practical lounge ~ such a massive improvement over the previous facility and far better than any other lounge that I have used at CDG. Well done CX.

I assume that you have found (like me) that the AA lounge is inferior in all respects, especially food/drink offering.
This is really a great lounge for those flying the short LHR hop with dirt-cheap Y tickets :).

Yes, AA lounge is same as it ever was ~ drab, cold, and poorly catered / serviced.

Very early on a Sunday, food looked pretty unappealing overall. Buffet of eggs, beans, potatos, cocktail sausages , congee, yogurt, pastry, whole fruit, cold cuts (turkey was nice though).

AA lounge significantly better with quiche, egg tortilla, better bread and cold cut selection, salad, fresh fruit salad. Everything in the Cathay lounge for food is also at AA lounge except congee.

liquor is better at CX (no champagne at AA) but not like the last time (several years ago.) when they had high end cognac (Camus XO maybe?).

Is it possible you were there too early and missed the CX catering? You describe a food layout I've never seen before at CX's CDG lounge. CDG catering isn't necessarily blow-away, but what you describe (breakfast) isn't something I've ever seen there before. Was the noodle bar operating? IIRC a lunch-type catering is offered before the midday CX flight, definitely not breakfast. Lunch both at the noodle bar and the buffet line.

I actually didn't realize the lounge was open at other times than around the CX flights. I guess perhaps CX is just collecting rent checks from other OW fliers on other metal. If that's the case, I've seen a similar situation in other lounges, where the operating carrier offers superior catering prior to their flight (essentially catering to "their" passengers) and has a significantly worse layout at other times.