'Good 1% resisters of the same value always sound the same'
That's so sad. Some people are incapable of, or unwilling to hear the difference.
I can't directly answer the question but can tell you that Mills are smooth and way better than the cast 'white' monsters that sound bad anywhere they are used, especially in power supplies.
Mills are great for low-pass and as shunt resistors but I find them a little too smooth in series with mids or tweet. I have been experimenting with Powertron, a Vishay foil resistor which is vivid and displays fine detail and a brilliance that lights up the top end. This is not to be confused with brightness.
The Powertrons are rated at 3W or 30W when mounted on a heatsink.