Basically, no comparison between KL1 on E1e body, and either LSHP or Arc4. The Arcs are brighter (22-33 lumens, depending on model and level, compared to 16 lumens for the KL1 [although this might be a bit conservative]), smaller, waterproof (rather than "weather resistant"), and extremely intelligent (if we're talking about the Arc4).
Be aware, however, that you are in the Arc Forum, and we tend to be prejudiced!!!
carmel