Hey Matt your photos are looking good!
I find when you limit yourself to one lens, your creativity starts to shine through :)
You find yourself finding a different perspective and making photos you normally wouldn't.
Have you played much with with the White Balance?
Mine is set at 10000K in the custom setting.
You camera should have the same picture controls as mine, I have played with mine to bump up the sharpness to 6 or 7. It's default if 4 or 5. It makes a big difference in the overall photo.
Hammers and tank is looking great :D