Well I only know what I have read here - that the K1 is bigger and heavier and the screen is not so good. I think you would be disappointed if you are used to the K3.
Unless you are a collector or nostalgic, it is probably always better to choose the latest versions of any gadget.
Your girlfriend probably will not like it either so your fears of being stuck with it may well come true. Your girlfriend may not want to invest the money in a new K3 now but you might find that you end up buying one anyway as well as being stuck with the K1 which neither of you want.
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