You likely wouldn’t see any improvement on the 40”. I know if I had the same model of my 4K TV in 40” I would not be able to tell a difference myself. The PPI of your TV is 110, which is pretty good. The PPI on mine is only 67, and each individual pixel is more defined and spread out. The improvement is definitely appreciated for my screen size.It's a 2014 Samsung 40" upgraded with an Evolution SEK3500, and yes, I can sit close enough to do a proper test.