Even at Leica , Zoom lenses do not reach the quality of Primes. You can buy R4 for 80 dollars from keh com and continue with your Elmar 24 or Summicron 50 for 400 or so dollars.

1000 dollars rest with you , if your R4 broke , you buy another one with another 80 dollars.

To use Leica lens on Canon is a murder , not less than that , its a yob business.