I've had another thought about the 28-200.
Recently I've been working with ways to reduce noise from high ISO photos with my micro four thirds G9 II. Lightroom Denoise actually works well for this. But I also wanted a small amount of AI sharpening; my M43 zooms could use some help. I have Topaz Photo AI as well as Topaz Sharpen AI, but was not able to get the low noise results I get with Lightroom Denoise when I added a little AI sharpening. On top of that Topaz still doesn't have RAW decoding for the G9 II (nor for the S5II). So I took a look at
DxO PureRAW 4. You may know this is a Lightroom plugin that brings much of DxO's capability to Lightroom, especially AI denoise and sharpening. This has worked out very well, and I'm adjusting my workflow with the G9 II around DxO PureRAW 4.
And then I was looking at the DPreview sample shots with the 28-200 on the S5IIx. The nightime street shots have terrible noise. And I thought "high noise, with a lens that's not the sharpest in the bag". How would those look with with DxO PureRAW 4? So I downloaded a bunch of the RAW shots and processed them. They are all very good. I still don't know if I'll get the 28-200, but there is a tempting path.
Why not just switch over from Lightroom to DxO PhotoLab, instead of using the plugin? PhotoLab has all the features in PureRAW. But I'm hooked on the true HDR photo processing in Lightroom, and the DxO products don't have this. For now the DxO PureRAW plugin for Lightroom is a good solution.