German Navy is completely cost ineffective.
Sachsen class frigates cost 700 million EUR, display 5600 tons, require 230 crew and have 32 VLS.
Comparison to Russian Navy (never mind PLAN):
Admiral Gorshkov class frigates cost 250 million USD equivalent, displace 5400 tons, require 210 crew, and have 32 VLS.
Germany does not lack money. They lack production. Since they lack production, most of the extra funding will simply go into price inflation, not increased production of military assets.
My guess is that it takes 3-5 years to ramp up the industrial base for most existing weapon systems.
That applies to the US and China as well.