The lightoutput won't change - it's the beamshape/focus/spill/throw that will change. The MN10/MN11 are identical in terms of output and runtime compared the the MN15/MN16, the larger reflector of the KT4 is able to reduce the sidespill, create a tighter beam and thus more throw.
You will notice a difference for sure , either with the LOLA or HOLA. /ubbthreads/images/graemlins/wink.gif
I like the M3 a lot for its formfactor, very smooth lines, compact, same with the M3T eventhough the head is somewhat larger.