I think that the "walls" of brilliant light that the 10X and MN21 produce are similar - of course, the 10X doesn't require your aim to be as good, and allow you to overwhelm. No place to hide.
The difference between the MN20 and MN21 is such that the MN21 is more Flood to the MN20 spot - but these are comparative concepts.
The ability to have the brilliant wall of light is one thing, but use it effectivily is another. It is one step towards the resolution.
Al