I've been using the Sennheiser G2 for close to five years now and I'm happy with them - they've never let me down. Recently I've been looking at the G3 and wondering if there's any real difference, and would it be worth the cost?
If in the UK...
The main reason would be if you want to work in Channel 38 (which is the new designated band for radio mics) a license fee should of course be paid for this. Otherwise if they are G2 Band E (look on the back) they still will work legally for the future in the Channel 70 unregulated band - I wouldnt worry about it too much if channel 70 works fine for you.
In terms of overall difference in 'quality' I haven't noticed anything, although I haven't scrutinised them like for like. I would also be interested if anyone has anything on this.
Senns G2s in my view are a great value bit of kit. The stock senn lavs are fine but I have upgraded my ones to trams, which if you have money to burn may be worth considering over a G3 upgrade (unless you would like channel 38 or have different mics already).
Dean - just had a look at your website. Nice work! You probably know all this already. Hopefully someone will approach this from a different angle as I am interested too.