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millsart, it's hard to answer that question because for some things X-E1 + 14mm is better than GR + GW3 and for other subjects it's the other way around. Overall I'd say that Fuji 14mm is clearly sharper in the corners than GW3. With my GW3 corners can be a bit soft even at f/8 and there is some purple fringing too, but that is easily removed.
Since I sometimes find x-trans problematic in Lightroom I tend to use GR for wide photos now, but I'm still in the honeymoon phase with it, so I don't know if that situation will last. I love shooting with X-E1 and colors rarely need any tweaking. Also, I'm not a pixel peeper so why do I even worry about a slight pixel smudging... Easier said than done though, and currently I'm confused and unsure, so I'll keep all three cameras (these two + RX1) for now and see what happens.
I did try GW3 on RX1 but wasn't impressed. The "bare" GR is way better so I much rather carry RX1 + GR than RX1 + GW3, and it's actually a bit lighter too, and of course more convenient since I don't have to keep screwing a converter on and off.