Looks good but...
if we pretend that there is objectively only one ‘best camera’ and ‘everyone’ wants it, there will be no competition will there? We’ll all have a Sony A9 and the other makers can just give up.
More realistically; your mates opinion is just an opinion, the salesman clearly has an agenda, and your requirements are not the same as mine, Robins or Jonneys. The ‘best’ camera for all of us is subjective, depending on our individual needs, personal preferences and circumstances.
For Robyn the best camera for him is a Canon, partly because he has an emotional attachment, and partly because he already has a bag full of canon gear and no desire to switch systems.
For me, I’d also pick Canon, I don’t need a FF mirrorless right now, but my next camera could be the ‘awful’ 6dII. Maybe one day I’ll buy Robins Canon R off him.
In conclusion, trying to boil down all equipment discussions down to ‘the best’ is not a ‘discussion’ and is frankly puerile.