I just did the exact same test.
I brewed a giant-sized batch of 42 gallons and split it in 9 carboys, 4 of which with the WB-06 and the rest with the Munich yeast.
the batch was:
60% pilsen malt
40% wheat malt (weyermann)
9 IBU worth of columbus hops
soft water (6,5 PH)
1048 OG
est. 9 EBC
I fermented for 10 days at 25ºC/ 77ºF, then dropped at 20ºC/ 69ºF for 3 more days then finally placed all carboys in my freezer to help sedimentation before racking.
at the time of the racking, here were my results:
WB-06: 1008/1009 FG (ap.att.82,7%)
Munich: 1014/1015 FG (ap.att.70%)
The munich sample was actually lighter in color that the wb-06. both had way more phenolic then fruity esters, which was quite surprising, considering the high fermentation temperature. The Munich sample was also quite sour. I used a PH measurement strip and the result was around 4 PH. Although not impossible, I would say that contamination is out of the question, as that character ONLY appeared in the Munich samples (and there were 5 carboys of those!). Unless, of course, there is a problem with the yeast.
the munich (in the back) and wb-06 samples
For what I read here, should I assume the munich must attenuate more? 1015 sounded quite high for the FG. but still, It wasnt supposed to word slower that the wb-06...
what about the sourness? was it expected? will it get better?