Originally posted by mcgregni yes you really have a dilemma ! I think most people here would be looking to you to answer the question for them
Although you asked about the focal range of 70-85 ..... If you don't like the weight of the bigger zoom then perhaps the 24-70mm at full zoom and the image cropped a bit would serve the purpose well ...? What's the bokeh like on that lens at wide apertures and full zoom ?
This is what I'd be doing. The 70-200 is ridiculously big. To me it is a tripod only lens, so if you are OK shooting portraits off a tripod (I am), then it's going to be a good lens, but it's way to big. I think for it to work, one would want to choose a slightly longer focal length, perhaps around 105-135 to get some working distance.
Or just use the 24-70 and crop a bit if necessary. The K1 has lots of cropping room.