Why interesting? The Prussians did build on their experience during the Napoleonic Wars to improve their artillery arm and by 1870 they may have had Europe's finest. They certainly were much more modern and developed than the French artillery arm in 1870-1871.
Colonel von Holtzman was an excellent artilleryman and did develop the gun limber with the ammunition chest attached to it as well as other innovations in the 1740s. Von Holtzman also invented/developed the screw quoin which was copied by the Austrians and the Russians. The Prussian artillery did very well in the War of the Austrian Succession and was the catalyst for the Liechtenstein reforms in Austria in the 1750s. Frederick did irreparable damage to both the Prussian artillery and engineer arms and it was the Austrian, not the Prussian, artillery that was the best in Europe in the Seven Years' War.
It should also be noted that the Prussians didn't establish an artillery school until 1791, over 100 years after the French had first done it and almost forty years after the Austrians established theirs at Budweis (which was modeled on the French). Further, the Prussians didn't have a unified system of artillery until 1816 after the conclusion of the wars. They were developmentally behind the other four major powers in 1815. An artillery system isn't solely weapons and vehicles. It is also training, education, doctrine, organization, and supporting organizations, such as an artillery train, which in Prussia wasn't militarized until after Jena.