In article , PAS
wrote:

I can't say it's good, because I've never used a Tamron or Sigma
long-range zoom.

Really! I've never used a D810 but I know it's a darn good camera. You
don't necessarily have to use something to know how good it is or isn't.

nice contradiction.

you've previously said the only way to know if sigma/foveon cameras are
any good is to use one.