There is as much joy with cheap equipment than is with the expensive ones.
But I consider a 300-400 USD lens not exactly cheap. You get brand new DSLR prime lenses for that kind of money! People buy complete cameras for this amount.
Just because Leica glass prices are sky high and entirely out of proportion, the "cheap" gear doesn't become cheap.
Think about it - put together a nice kit of three lenses and an old RF film body and you easily top out more expenses than buying one of the advanced DSLR bodies with a kit lens nowadays.
Anyway, I personally love, how easy you can work on the Nikon and Canon lenses, cleaning, adjusting and even modifying them.
On many lenses of the time, Leica indeed went a different philosophical path in construction, while especially Canon designed their RF lenses to be fully adjustable, which I love.
They might not feel as refined and expensive and did not have the engineering dedication, to go to the edge of what is possible, but they are wonderful lenses!
As a nice example, I just finished the focussing mount of a Canon 0.95 - THAT is a hunk of metal ! Canon engineers entirely overbuilt this focussing unit! It probably would pierce an engine block, shot from a Canon and still focus smoothly thereafter!
Compare this with the much more refined and optimized (weight) of a Noctilux mount.
The construction of the Noctilux f1 looks like that of an F1 car, compared to the NASCAR built of the Canon lens.
I see, I am swerving off topic ;-)
Raid, enjoy those lenses coming your way! I am envious on the Nikkor 21mm btw.