If it's just the logo I need I'll usually go hunting through various PDFs posted online at different websites until I find a proper vector-based element of the logo. The Zeiss logo probably wouldn't be hard to find at all as a vector element inside a PDF.
As for fonts that look ballpark similar, I think Mecanorma's Renault typeface is quite a bit closer than Clarendon. It's still not a match though. Many logos from well known brands have totally custom lettering.