E-5 vs K-5 ii Locked

DaveP E1 wrote:

Give me a compelling reason to stick with Oly. I have a once in a lifetime vacation coming up - Machu Picchu & Galapogos and will retire my trusty E-1 for something with IS and more reach. The E-5 will require all new lenses, 12-60 & 50-200 ~$3300. The Pentax K-5 ii on the other hand has a nice walk-around 18-135mm (x1.5) f3.8 kit lens lens with supposed better IQ, dynamic range, very high ISO ~$1500. With Oly possibly abandoning the semi-pro SLR market it seems like a no-brainer. Ruggedness/ weatherproofing/dependability is high on my list of attributes. Can the K-5 ii comapre with the build quaility of the E-1. For that matter, can even the E-5 compare?
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Dave P E1 14-54 FL50