I did a dummy booking on AC for Oct.20-27 YYZ-MUC non stop return in Y and it came out as $640 CAD with a further $375 in taxes so $1015 all in if you book before Sept.23. $4600 CAD in discounted J. The problem with this route of course is that AC and LH have no competition on it so they are always expensive. Unfortunately YYZ-LHR is actually more expensive in Y and J (I class) on both AC and BA on those days. Pick the right days on BA though and you can get YYZ-MUC in discounted J for $3815 all in which isn't bad for this route.