At Frankfurt T2 they seperate the Schengen and non-Schengen PAX so all that is available is the BA lounge. That is available to CE PAX.
The CX/QF lounge is ISTR in the E gate area and not easily got at and the JL lounge has some very odd hours. I normally travel out of T2 in the afternoon and the JL lounge is usually closed.
I have never heard the staff call for CE and Golds to board first but that is a common complaint at most outstations. BA quite often use the 380 gates so in theory there's plenty of escalators and jetties, but there's only one door on the Airbuses! If you are on the sole 767 then FRAPORT will usually attach two jetties.