For a start, all these tools aspire to be a one stop shop for the finance department, which includes a fair share of reporting, analysis, drilldown, dashboarding, etc. The BI-stuff. Konstrukt doesn't try to overlap your BI-tools, but rather complement them with the stuff they lack. This makes Konstrukt much more lightweight and quicker to deploy, as well as a better fit in your data architecture.
In terms of features around data entry, planning, simulations and modeling, Konstrukt is just as powerful as the big players mentioned. Only much cheaper, sleeker and neater. Also, it doesn't require a year long project to roll out.
PS. If you're afraid of losing your job cause you chose the wrong tool, just increase your budget 20x and buy Oracle. ;) DS.