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The Lectrosonic that I've worked with simply sound better and have a much more reliable RF system. Most are diversity receivers, and they offer a higher transmit power for (normally) fritz free operation in normal distances. I can't remember the different models to recommend, but they have been at the top for at least 10 years so hard to find one that doesn't work well.
Word on the Rodelink system. I tested one over the weekend. Bought a set Monday.
The receiver is a tad wider than many receivers, but in general wasn't too much problem. Transmitter and receiver button requires a one second (roughly) push to turn on and off, so can't be accidentally switched off easily.
Its a 2.4Ghtz system, your mileage may vary in open field where the transmitter is placed over 5 metres away. In a place (since the OP is talking about weddings), like a hall / church its gold. The mic itself isn't far off a cos 11 in quality - I really liked the sound, the cos 11 design and quality also confirmed to me by a professional sound recordist. I have a little hands on review coming in the next couple of days.
If your interested in the system and are in Melbourne, give Ric Creaser a call at Lemac and tell him I sent you (no benefit to me whatsoever in doing this).
I'm pretty sure this will be my first choice for basic wireless setups going forward. It's a steal with what is essentially a $200 microphone included. I'm already thinking about whether I should order a second system.
Do you know if you can send a signal from two transmitters to one receiver to minimise the bulk at the recording end?
In the review Curtis Judd posted on YouTube, he mentions that each transmitter requires its own dedicated receiver. You can't use one receiver with two transmitters.
At what model does that start being possible?
None.
One transmitter to one receiver, not matter how much you spend. There are, however, some manufacturers offering dual receiver units. These are simply two receivers housed in a single chassis with separate outputs for each receiver (though there are some models that have a "mix" function to send both receiver outputs as a single signal to the mixer/recorder/camera... but this is generally not a good idea as it gives little option to fix issues in post).

You only have 2 channels in you gh4, more than two systems and you should go outboard recorder with mix back to camera to help sync later. With the current Lectrosonic products, your are also paying for size, the transmitters are tiny, even some of the receivers are tiny.