What a strange conversation. For the record I have a Lamy 2000 and several Sailors. The Lamy nib isn't a real nail, all their nibs respond (not flex) with writing pressure though, it's just not natural for me to want to with the Sailors as additional pressure doesn't yield much benefit I find with the one exception of the KOP nib. The Platinum president nib is a proper 'shouting from the rooftops' nail that shows no benefit from writing with pressure but what a magnificent nail it is!
It's fortuitous that this thread has just appeared as I have been dithering over the Lamy 2000 medium or fine decision for the last week. I sold a few pens lately and unexpectedly have decided another 2000 is a good thing to reward myself with. Mainly for the slip cap and discreetness at work and because I have just fallen for my existing 2000 with OB nib again. It's far too broad and wet for work but I love it for casual writing.
Your writing samples have convinced me the medium is what I need. Particularly as I absolutely look for a nib that is responsive in the way your sample shows. Accepting that it will have changed in the days following that sample, I don't always want the characteristic a lot of Japanese nibs have, and your Sailor shows it, of consistent flow and line width. I also like the variation that comes from a responsive (not flex, I do not mean flex...) nib. It seems to be a trait that is quite difficult to find reliably.
Is your 2000 still responsive like you found when you first started using it or has the flow increased so much the lines are uniform now?