Interesting post bmer
I want to say something: of course the G, Hummer and Land-Rover are boxy for all-terrain purposes. Of course a SUV is basically, technially a SW with higher groundclearance:
BUT a SUV is also here to give you a sense of occasion, and of adventure, that you don't find in a SW.
So the GLK is strongly linked to the G and its boxy shape to sugger strength, all-terrain ability, adventure and Camel Trophy. It will appeal to persons more interested in adventure than in speed. It looks like it could go everywhere, from Sahara to Amazonia, whereas the ML looks more like a sporty, modern SUV, better onroad than offroad:
Sure it isn't a real all-terrain, but it looks like it was, and it is what some people want. It looks "genuine all-terrain".
I think it is brilliant to offer both sporty and all-terrain look.
Now MB has:
-A genuine offraoder, fabulous and cool, and arguably the most capable offraoder in the world: His Majesty the G
-An Escalade-fighter, American-looking giant, 7-seater: GL
-A sporty looking SUV: the ML
-A manly, "genuine looking", edgy and adventurer SUV: the GLK
-A van for all-comfort travel with luggage (but a smallish 5er seat...): the R
The most complete and coherent SUV/allterrain line-up ever.
And there are a lot of person interested in either C or E, 3 or 5...so people who prefer the GLK will buy it instead of the ML, and people who prefer the ML will buy it, because I guess the price difference won't be monstruous.