In it's day, before WWII, the Contax II was THE 35mm camera. It had a broader & better line up than Leica, was technologically far superior (especially with the invention of lens coating in 1935) & had better ergonomics than Leica (single RF/VF window, single speed dial, easy to use with a single hand, etc.). For more detail, you can read the Contax pages at our esteemed head bartender's website
http://www.cameraquest.com/classics.htm
In 1936, the Contax III was the definition of High Tech - the equal both in advanced design & cost to the Canon 1d Mk IV due out next spring.
Now, comparing that camera line to what we have today, 70+ years later, is really not a fair comparison. It's not anywhere near as easy to use as any modern camera. The VF/RF that was so great in the day, utterly s*cks compared to the modern standard, as just one example. But like there are folks here that dearly love shooting with their pre-war Leica I, II & III's, I enjoy shooting that Contax II more than any other camera I own. It's kind of like a chopped Harley-Davidson or a Triumph Bonneville - if you don't "get" it, it's not something that can easily be explained.
I own both a 1937 Contax II & a 1977 Kiev 4a which are the same basic design although the FSU production is somewhat simplified over the decades & had iffier QC. My lenses are half CZJ & half FSU. I'm activly watching for an uncoated 35/2.8 Biogon that I can afford but probably won't replace my Jupiter-3 50/1.5 or Jupiter-11 135/4 lenses because the ones I own are just as good as pre-war CZJ.
There is no more aesthetically pleasing shooting experiance for me than to grab that Contax with a 1937 uncoated collapsible 50/2.8 Tessar mounted and then go waliking the boundaries between rural & urban Wisconsin.
Beyond that, it's up to you. Hope this was of some help,
William