Let's estimate the height of the main Jin Yong characters...
For Xiao Feng, he should be at least 1.9m I guess.. He's Khitan and was described to be of large size.
Duan Yu is also described as tall, so he should be at least 1.8m..
What about the other character's height? Let's speculate. And could anyone in Jin Yong universe be taller than Xiao Feng?