mkh30/40 or mkh30/50?

["evs" onomatopoetik]

hi everyone again,
now that its clear to me that i  got to have the mkh mics i=B4m
wondering if anyone here compared the mkh30/40 ms combination with
the mkh30/50?
or an equal situation with two mkh80?
i don=B4t have the possibility to rent a mkh30, so i have to buy one of =

those on suspicion.
what i want, is to have a wider and deeper image while auditioning.
i=B4m more into recording ambiance than single sounds. (but single
sounds , too.)
its not so important for me to have a wide view while i=B4m recording.
the result is more important.
is it clear what i mean?
and i think i have heared that the mkh30/50 combination ironical
seems to give you a wider and deeper image than if you use a mkh40..
can anyone say something to this?

all the best
emil