Nikkor-M 200/8 USD 525

Other than if you are a backpacker, is this lens really twice as good as any number of 210mm plasmats one could buy instead??? All of which can be had for about half this price. Keep in mind a Nikkor-M is a Tessar design from about a century ago. If you want small, a G-Claron at f9 is about the same size and will cover 8X10. Educate me, what am I missing??? KFry
PS I own a 300mm Nikkor-M and it is an awesome chunk of glass. But at this focal length a 300mm plasmat is in a whole different universe in terms of size and weight.