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I'm not familiar with either, but a quick search is showing the Scenic 1.6 16v coming up as either 111 or 115bhp, depending on the year.
Based on that, I'd guess that there's probably not much in it torque-wise up to around 4000rpm, where the diesel will force you to change up, but the petrol would give you another 2000-ish RPM of useable torque.
So in a nutshell, if you never take your current 1.6 past about 4000rpm, you're not likely to notice much difference and of course you will see the benefits in fuel economy. If you do ever thrash the 1.6 to anywhere near the red-line, then you're likely to find the 1.5dCi 80 disappointing.
The only way you'll know for sure is to take one for a spin.
Currently in Horatio's garage:
2010 Laguna III Initiale.