Shimano GRX 810 vs R8020 hydraulic shifters

I'm not sure if this is better here or in the buying forum section but I figure there's more likely to be people here with experience of the GRX groupset.
I have a 2017 Trek Domane 5 SL Disc which comes with the RS505 2x11 shifters with hydraulic brakes, I've never been keen on the feel of these shifters compared to the RS685's on another bike but it's not felt like it's worth changing them. Although the bike is a road bike and only ever used as a road bike I'm quite keen on the sound of the new GRX 810 shifters especially the servo wave mechanism as I'm more of a mountain biker and the behaviour sounds similar. Many of the articles I've been reading so far are reviewing the Di2 version of the shifters which are clearly quite a different design so comments on those are not necessarily relevant to the mechanical versions.
Or the alternative is just to stick a pair of R8020's on, I'd be interested to hear any feedback on people using the new GRX shifters.
I have a 2017 Trek Domane 5 SL Disc which comes with the RS505 2x11 shifters with hydraulic brakes, I've never been keen on the feel of these shifters compared to the RS685's on another bike but it's not felt like it's worth changing them. Although the bike is a road bike and only ever used as a road bike I'm quite keen on the sound of the new GRX 810 shifters especially the servo wave mechanism as I'm more of a mountain biker and the behaviour sounds similar. Many of the articles I've been reading so far are reviewing the Di2 version of the shifters which are clearly quite a different design so comments on those are not necessarily relevant to the mechanical versions.
Or the alternative is just to stick a pair of R8020's on, I'd be interested to hear any feedback on people using the new GRX shifters.
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Brake performance with the 9/8/7000 series levers has never been an issue for me.
The 505s were always a relatively budget option and the shape and looks were never my favourite thing - I'm just about to replace the last pair we have in service with some lightly used 7000 series levers I obtained from someone with upgrade-itis.
There's nothing wrong with the RS685 shifting but I like the featherweight control of the servowave MTB brakes and that it seems to translate to easier braking while on the hoods for the GRX shifters. Hence wondering how they compare to the RS685's in practice.