I have a K3 too, which replaced my K30, which suffered, out of the warranty period, with a failed "aperture block".
I really like it - feels as solid as a rock, and has masses variable control features for any situation.
However it did have one minor problem, which was the Date and Time settings being lost every time that I changed the battery, and if I forgot to reset them, it messed up my photo indexing system.
Fortunately (???), this happened two weeks before my warranty expired, and so it is now away at the repairers, being fixed.
So, enjoy your K3, may it give you many years faithful service.