Early WWI Imperial German Uniforms

The big knapsack that the early German soldiers wore and then sort of began discarding during First Ypres, I think:




I am not certain, but it looks like the Officer and soldier wearing the Pickelhaubes are wearing the second version of the original 1914 M1910 uniform that was also issued in September (?) 1914.

Or, it could just be a special design for the Prussian Guards battalions(?).