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The R1 is the regular Polartec Power Grid, and is the 6.8 oz/sqy fabric weight, which will be a lot warmer.
I'd say the temp range you mentioned, 50-60 degrees, is still accurate for this 3.8oz weight as an active layer, in case that helps anyone. I've never owned an R1 but I would imagine it would be suitable at 50-60 degree standing around in camp. But with this Rab, using the 3.8 oz HE fabric, just throw on a wind shell and you will drastically increase the thermal efficiency for colder active pursuits or those mild nights in camp.
Yeah the 50-60 I mentioned on the R1 range was really more for around town wear. I've hiked in the R1 with a lightweight baselayer around 40-45 and been plenty comfortable. The Rab sounds great as a lighter weight layer. I recently picked up a Outdoor Research Ferrosi softshell that I really like. This Rab plus the OR would cover a pretty wide temp range.