I have a lot of marginal snaps from way back which I found Topaz sharpen ( trial edition ) can turn into pretty acceptable images - these are not portraits BTW.
I thought I would try the 3 in 1 Topaz AI photo since I had a thought about batch processing which it seems almost designed for and so I tried this package which is on offer at the moment. Unfortunately, the "sharpen" part of this is quite a bit limited compared to the AI Sharpen stand alone app and so I cancelled the order ( Topaz were very quick in refunding BTW. ) Basically, I could tweak settings more effectively in the stand alone app.
Just mulling what to do now - I could get the single license for AI Sharpen. The three separate apps are available discounted as a bundle - and you get AI Photo for free but $199 is posssibly more than I want to spend. I use PL6 /DeepPrime XD quite a bit in any case so don't need NR but that app just has the "classic" standard unsharp mask and doesn't do enough of what I want.
The only thing that stops me just getting AI Sharpen alone is that AI Giga ( trial version ) which I have been playing around a bit with does seem to give some improvement in image quality upscaling to 2X even though I am only viewing the image on a small 15 inch laptop. It is possibly because some of the images are at 10 mpx though I am not seeing obvious pixelation at that image scale. There is some "smoothing" going on.
Richard
PS I neither sell nor exhibit my photos so I have no ethical or other issues in using AI even though these add to an image detail that just isn't there on capture.