What are the SZD55 equivilents

I saw a SZD55 advertised and want to know what does it compare to .
I looked at the index of types and it seems Discus1 or slightly better
but sink rate seems a little high.
Some opinions from those who have flown one.
I am actively looking for a glider for myself and trying to fill in my
knowledge of some types I have never seen.
Cockpit size is an issue as I am big guy.
gary