I've seen photos of food from CR where the portions looked very small. They were all taken last year when CR was a 2 TS Signature Restaurant.
I ate there last month and the portions were large. In fact, I left there so full I was uncomfortable.
I had the Ceasar Salad with Grilled Chicken Breast. It was an entire chicken breast.
I had the NY Strip steak, which was a normal restaurant-sized steak (probably around 12oz to 14oz). It came with asparagus, baby carrots, and au gratin potato casserole. It was all delicious...the steak was PERFECT!
For dessert I had the Chocolate Wave, which was like a little piece of heaven. I was already stuffed, but ate almost the entire dessert anyway because it was so good.
They also bring unlimited bread to the table.
I haven't eaten at 50s PT yet, but I can't imagine for a second that it could be better food or a better value.
FWIW, even though I know 50s is a "fun" restaurant, my kids loved CR. They were each given a fish directory, so they spent the entire time we were there trying to identify every fish that swam past.