Mark & Karen, by some distance (I'm not influenced by the judges (scripted) comments, or by their highly dubious scoring methods. I prefer to use my own judgement, and I can tell you : Frankie & Kevin's rumba just did NOTHING for me. It was like John Sargent's Paso Doble at half-speed! Their AT worked well though, much better than I'd expected. But Mark's rumba was the best male rumba I've seen (alongside Ben Cohen's) and the 2nd best rumba this series (Pixie's was sublime). Mark is underrated, and deserves to do well in the final, especially when finally unshackled from the handicap of the judges' scores (ie all public vote). Big push will be for Simon though, I can assure you of that. They are desperate for a non-white winner (nothing wrong with that). Oh, and sorry, but that doesn't include Frankie!
Best of luck to all.