I don't agree with the phrase "decline in Zemana capabilities." Zemana focused the on-demand scanning when it first appeared. I would use the phrase "Picking up direction". "Zemana Ultimate" will probably have some new capabilities, focusing probably on some sort of today more common and serious threats mechanics. But Let's focus in the current Zemana:
It scans fast, it has root certificate detection capabilities; which is a handy thing to have in a on-demand anti malware. You wouldn't believe me how many computers I have cleaned where Zemana helped a lot by detecting irregular certificates installed in these infected computers. I know you could just use sigcheck to do this task, but Zemana also detects malware and has nice cloud detection, its a good combo. I can't agree with the first phrase I noted above. I can agree that it is not the perfect software to place as your main protection module "For real time protection" but Zemana has never called for this. Zemana is solid software in terms of usability and for what it best offers, powerful on-demand scanner. I wouldn't put Zemana in the "How many threats can it detects" but more likely in "What it is able to remove". I got a free Key since the BETA and it is a good friend to have, it will work great to use alongside many other security software. This is obviously my opinion after using many different security software outhere.