Considering they've improved the value proposition greatly compared to where we were with the 2019 15" I'm now pretty set on staying with MBP, having said this, I'm not jumping right in. I'm waiting a few months to see how it holds up with people using it day in and out, this also gives the benefit of avoiding any initial batch issues (seem to get a slightly higher rate of manufacturing defects in the initial production run) and any supply constraint should I encounter any issues and need to swap the unit. Getting it £1-200 under the MSRP to put towards the cost of new dongles, cables, USB C accessories and that £20 power lead that used to come in the box would also be nice...
It will also be interesting to see where things go with a potential 14" (don't know that I'd get on with a sub 15.4" screen, but worth a look if it's 14.4" or so) or 15" MacBook Air and what's happening with the ARM transition and/ or a full redesign with the rumoured mini LED (HDR, ProMotion?) display.
For others who are actually doing intensive work, I would observe the graphics, while a big jump over the 15" it replaces, are still miles behind a Windows competitor... you can easily get an RTX 2070 laptop for £2,400, and while it's not going to be as sleek, it will certainly offer it's own set of benefits (user serviceable storage and RAM at the least, full 4K displays are quite common as well).