Originally posted by cdd29 f/4.5 1/80, ISO400
The exposure that the camera chose really should have set your alarm bells ringing, as those are settings for very low light yet you mention the sky being bright. If the camera was going for settings in that range then it's entirely likely that even your seven shot bracket wouldn't have included a decent exposure.
The question is: How bright was the sky? You say that it was shot late in the evening, but even at that time of the day -- assuming the sun isn't actually setting -- the sky is usually only about a stop or two below Sunny 16.
Assuming that you haven't got an incident meter, the best thing would be to take a spot reading off the midrange greens in the trees to establish an exposure for the ground. No doubt in those conditions it would have resulted in overexposing the sky, but with the K-1 you can probably get away with at least two stops of that to recover in post-processing. Maybe three. The only question then would be what happens to the deepest shadows on the ground, but realistically you're just going to have to let them end up where they will. So a spot reading off the midrange greens and then checking the histogram to make sure the sky isn't too far overexposed would have been a good way to go. You could double-check that by spot metering the brightest part of the sky that you want to keep some detail in and mentally adding two to three stops. If that's within the range of the exposure that you metered off the greens then you should be fine.
What I'm saying is: Don't rely on the camera. Through-the-lens metering is only ever a compromise. Learn to trust your eyes. If the brightness of the sky wasn't much below its daylight level then you should have noticed that the camera was trying to wildly overexpose it. Then it would have been a simple question of by how much your camera's dynamic range would allow you to overexpose the sky and underexpose the ground in order to give you a raw file with the necessary tones preserved for editing.