The differences were fairly obvious to me being honest. Much more than I expected, as I really wanted to sell the Naim and use a Bluesound to save a few quid.
Not so much between the Node, NP5 and Meridian 210, (the Np5 was clearly the worst though), but between those and the Naim was big.
I spent a week playing around, doing some semi blind testing always came out knowing the Naim. I would put the Bluesound second, and the 210 third, NP5 fourth.
The quality of the source, is becoming in my opinion, equally as important as the DAC, and I believe the majority of the SQ improvements are based around power supplies. I think a Bluesound with an LPS and the common PSU tweak would bring it closer to the NAIM but I only had a bog standard one to try. The Naim was the only unit using a proper Toroidal power supply.
For me now, I feel that it's wasteful to spend huge amounts on a good DAC and feed a poor quality source - probably why this USB re-clocker was invented as mentioned by Hecky earlier with the ability to improve a RPI. Having just bought a really nice R2R, an Aqua La Voce S3 (which I would love to compare against your Venus if you live near London!) I want to get the most from it, and the Node definitely didn't give me that when the Naim was present.
I'm on the cusp of ordering an Innous Zen or Zenith, if I manage to push myself over the emotional hurdle of the cost lol, I'll be able to compare against the Naim. If theres no improvement, it will go back and Ill be satisfied that the Naim is as far as I can go at this sort of price range.
One thing I do know now, is how good the Naim is at pretty much everything. As a one box solution, its probably the best on the market at its price point, and probably a fair bit beyond that.