Chuck -- those are good suggestions, I'll have to start putting together a listening library like that!
Page -- I'd say you're right that different patterns would yield a slightly different sound, but assuming all the mics you have have decent off-axis response and that it is no more difference than angles of 110 compared to 90, IME those differences will be subtle, much moreso than the actual tonality of the mics. In theory, the wider pattern of DIN (20cm) compared to ORTF (17cm) would make the ORTF pair sound a bit more bright since it would have less phase cancellation than the DIN pair, which affects high frequencies more due to their wavelength. This would be very subtle. OTOH, the ORTF pair would be more off-axis and most mics, even good ones, have relatively worse off axis response at high frequencies. So this wider angle would make the ORTF pair sound less bright than the DIN pair. Still though, for rough estimations regarding a mic's general character, I think the tonality of the mic will be more of a factor than ORTF vs DIN patterns.
You should do some listening of your mic compared to other mic brands at the same show. Perhaps you've already got taping friends you've taped by that you can get copies of their recordings. Or go to the Archive. After a quick search, I saw there were some TLG shows that were taped with both the Busman mic and AKG 461's and 481's. Listen to the busman compared to those and see what you think. The AKGs are generally viewed to be somewhere on the neutral/transparent scale, with some finding them to be a bit detailed or brightish (but not dark). There also is an archive DBT show with the Busman LD and a pair of schoeps. Most find the schoeps to be on the darker side, or at least on the scale of dark to neutral. By listening to the Busman compared to AKGs and schoeps, you might be better able to place at least roughly where on the scale you find the BSCS to be.