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Beautiful nature shots from Philip's Rokkor 300mm (can you hand-hold a 300?!), Briantho's HDR snow scene, hOOligan's pup, Sebboh's flowers!
handholding 300mm on a NEX-6 or 7 is pretty easy assuming you have good long lens technique, not sure about on a 5N/R.
I never got shots like yours with the M-Rokkor 40, hmm, odd. will have to think about getting the Cron.
apertures on those were f/4, f/2, f/2.8, f/4, and f/2.8 respectively. from f/2.8 on it is amazingly sharp within the sphere of focus. field curvature on it goes the opposite direction of most zeiss lenses, making for nicer bokeh and subject isolation.