Well the problem here is the unnecessary comparison between cases, the article is far too short to know the full implications of the crimes committed, the criminal history of the individuals involved and so on. It's far too time consuming but it would be far more responsible to replicate similar cases (to which we would know all the aspects) in the British legal frame and compare the respective fairness of punishments.
In this particular case what should be on the table are the broader aspects of white-collar crimes of this nature and the respective legal punishments. Perhaps most of us would agree they are no where near just, I agree there is no violent aspect in the crime but for the most part there isn't an immediate and desperate need (sometimes present in violent crimes) to justify and mitigate the crime and respective punishment.
Furthermore these are individuals who for the most part and for what we are told are paid and receive substantial rewards for occupying positions with considerable responsibilities. Even if responsibilities are taken in consideration do they carry the same value on a criminal aspect? from what I have seen and to what my opinion regarding these crimes is concerned I would hardly say so.
Not disregarding the actual victims who can be put to extreme distress, and I would argue losing your savings is no less traumatic than being mugged on the street, these are crimes with great implications to the fairness of our society and should be judged accordingly.