I woke up early this morning, around 5.30 AM, and since it was very clear and I had the day off, I went out to take a look at the Moon with my 114-year old 85mm Zeiss A apochromat.
The seeing was fairly good and the air crystal clear. The lunar views were a treat through the 85mm with binoviewer and 24mm ES68 eyepieces.
Sirius was shining brightly high in the SSE and after looking at the Moon for a while, I decided to take a look, before the skies got too bright. Almost right away I spotted the companion, using the same setup as for the Moon. It was almost conspicuosly easy, even if I couldn't see it all the time, due to turbulence at the low altitude, but it remained visible in the same, correct location, as a small, flickering speckle, as I moved Sirius around the field. I would call it about as difficult as Rigel B in a 50mm. The altitude of Sirius was around 17° at the time of observation. I'm at 55°N.