It will depend on the aircraft that you use. Here's Seatguru's 777-300er as an example.

http://labellecuisine.com/archives/salad/Julia's%20(Authentic)%20Caesar%20Salad.htm

Note that they are one of the few airlines that actually have wider seats in Premium Economy. I recently flew UA's Premium Economy and the seat width was the same as economy.

Just to be clear Rasta, there is a big difference between what should be called something like "Economy Plus" vs "Premium Economy". The first is nothing more than a regular seat with extra legroom. It is not sold as a separate cabin, but either sold as an add-on or given to elites. The second is what Air France's product is and is sold as a separate product.

With regards to the query... It is a good product. The service is decent, the cabin quiet, the extra width is nice, and the shell-style construction means that you don't have anyone intruding into your space. However, the seats are on the hard side, and I don't think the "recline" really works that well. All in all, it is certainly a nice step up from economy, but I would have to give the edge to the BA product due to the comfort when reclined.

As for feet up, you have a footrest, but your feet are still pointed toward the ground, there is not enough room to stretch them out straight in front of you.

Have you considered any of the foot rest products on the market? Such as these:

http://www.amazon.com/Folding-Footrest-Relax-Ships-Priority/dp/B000AXTU62

http://www.corporatetravelsafety.com/catalog/inflatable-foot-rest-p-1065.html

http://www.airplanefootrest.com/

I don't know when you're thinking of buying - we are flying PE on Air France in April to Tahiti out of LAX. I'll post a review when we get back. Hope you'll do the same if you fly before then!