I've had one's in the 1200g range...I KNOW that's not the largest anyone's had on here though. I don't have pictures of her anymore, but you wouldn't have known from pictures that she was that large. She looked more like an 800-900g animal.
The heaviest I've owned was ~1200. You will find the extra large girls are usually 5+ years old. They tend to gain density and size as they age. Starting at about 3 years I have to be really diligent about checking collars because their neck gets wider. Not fattier, just bigger.