Tom, I just took a quick look. The one with the metal arch is just soft, probably camera shake. The one with the brick bridge, the bricks look fine but the grass is out of focus, because you're shooting wide open at f/2. I can process it, but that grass is always going to be a blur. The third file doesn't seem to have finished uploading yet.
Based on this quick look, I would say you're judging from the wrong starting point. Don't even bother borrowing another camera. Go back and take the bridge shot again (it's a nice composition, bar the half-person in the arch) but with a tripod and the aperture at f/8 or so, focusing on the bricks. After that, if you're not happy with the sharpness, I'll be happy to see if I can do any better.
Edit: OK, I have the house one now. That looks like a better starting point. Will see how it turns out.