LFF forward sums it up quite well. Where the point with the most pressing consequence is that he lied under oath to the privileges committee. If there is credible evidence, then it should be investigated as a possible criminal offence.
Johnson was also part of a campaign that tried to undermine the committee. My point of view is that this is the most despicable thing anyone can do while under the spotlight of an inquiry. It is an attempt to subvert not only the sovereignty of parliament, but also the credibility of those who act for it.
He has consistently abused his position in parliament since coming to office. He has some very dubious history regarding his Russian connections, notably Lebedev. The Tories who kept this man in office for so long should be brought to account at the next election. He is a disgrace to all those who came before him, who genuinely tried to do good for this country. I have no understanding how we can even begin to consider his honours list. Allowing this list to go through is testament that we need something other than the Lords for secondary accountability. The process we have now is mired by corruption.
I doubt he really cares. Bruises his ego but then he sees his own "reality". The tragic thing is obviously the damage he has done to the country.
The interesting aspect will be to now watch those who still defend him.
He only cares as far as his ego takes him, which is a fair amount - he started damage control before the report even came out (calling the committee liars, hypocrites, etc).