Well not quite correct, Sky's transmission on TP33 on Astra 2B is infact in 8PSK as per the DVB-S2 spec, not QPSK as used by DVB-S, that said your current dish/lnb is fine, just the STB needs replacing for one that supports DVB-S2, MPEG4 and HD frame formats.
DVB-S2 using 8psk gives roughly a...