K3 and Sony both have Pearl screen which is the best e-ink screen currently available and used by products which are on sale.
K3 have a keyboard while Sony x50 model use a very good touchscreen with no glare.
Personally i think Sony x50 (350, 650, 950) do have a better PDF engine. Therefore i would recommend Sony.
Which model ? Well, Sony 950 would be best but is sold only in the US and must be ordered using services like USunlocked.com or a store which ships overseas. PRS-350 would be to small for PDFs although PDF reflow is very good on Sony models. So it may come down to PRS-650 which is available ouside the US and 6" are better than 5" for PDF viewing.
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