Pentax has always been known for producing compact, elegantly designed lenses and it is only with the advent of the K-1 series of full-frame DSLRs that the size of the lenses has started to become significant and somewhat out of step with that ethos. The current 70-200mm f/2.8 is a good example of this, so it is interesting that now we have a new, significantly smaller and lighter 70-210mm lens, in fact around half the weight. The loss is the maximum aperture, reduced from f/2.8 to f/4, and for many, this will be an equation that favours the travel photographer in particular.
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https://www.ephotozine.com/article/pentax-hd-pentax-d-fa-70-210mm-f-4-ed-sdm-wr-review-34615