Carl Zeiss Jena 35mm f2.4 vs Auto-Takumar 35/2.3 vs Sigma 30/1.4 vs Pentax 35/2.8 Macro. Old vs new!

The Carl Zeiss Jena 35mm f2.4 ( Flektogon / Prakticar ) is a very highly regarded vintage lens. But despite being an active collector of old lenses, I've never bought one. I’ve recently had the chance to try the lens and compare it with three other lenses – old and new. This video presents my conclusions.