However, to add a layer of unpredictability to proceedings as we await the last two rounds of the pool stage in the New Year, there were also outstanding wins on the road by Northampton Saints, who turned the tables on Leinster Rugby at a packed Aviva Stadium, by Edinburgh Rugby, impressive winners over Gloucester Rugby at Kingsholm, and by Toulouse, who exacted summary revenge on Connacht Rugby in Galway.
Not surprisingly, the conclusion of Round 4 wasn't without its share of drama as Leicester pulled a result out of the fire in Montpellier where a superbly-taken last minute try by Niki Goneva, calmly converted by Ryan Lamb, gave the English club a precious first Heineken Cup victory on French soil since 2006.
And on Saturday, there was another nerve-tingling finish at Stade Aime Giral where Munster appeared to be dead and buried only to break Perpignan hearts with a brilliant last-play sidestep and finish by the emerging JJ Hanrahan.
As the scores keep on coming this season - 189 tries to date at an average of four per game, and 1,943 points at an average of 40 per game - Ulster are now the only unbeaten club in the tournament. The 1999 champions are currently on target to be top seeds going into the quarter-finals with four wins and 18 points from Pool 5, with the next best-ranked pool leaders, Toulon (Pool 2), Toulouse and Saracens (Pool 3) and Clermont (Pool 4), all on 15 points.
If the powerhouse Clermont wing, Naipolioni Nalaga, made a little bit of history by scoring the fastest tournament try on record after just 18 seconds in the French club's impressive 31-13 victory at Parc y Scarlets, Harlequins are closing in on a much more significant achievement.
After looking down and very much out following successive Pool 4 defeats in the opening two rounds, Director of Rugby, Conor O'Shea, and his players have hauled themselves right back into contention with back-to-back wins against Racing Métro 92, and now trail pool-toppers Clermont by four points.
With Quins set to take on Clermont in what promises to be a mouth-watering clash at the Twickenham Stoop in Round 5, they could become the first club to reach the knockout stage after losing their first two games.
Other Round 5 confrontations to savour in the New Year - the exact dates and kick-off times for Rounds 5 and 6 will be announced on Wednesday - include the heavyweight meeting of Toulouse and Saracens at Stade Ernest Wallon which has all the makings of a Pool 3 decider, while Toulon take Cardiff Blues to Nice for what again is likely to be the key match in Pool 2.
Elsewhere, Munster will expect a hot reception in Pool 6 at Kingsholm where Gloucester will be determined to produce a performance for their fans following the setback against Edinburgh. They are second in the pool, five points behind Munster.
With the six pool winners and the two best-ranked runners-up set to go through to the Heineken Cup quarter-finals in April 2014, places in the Amlin Challenge Cup knockout stage will also soon come into focus.
A second chance of silverware is on offer for the third, fourth and fifth-ranked runners- up in the Heineken Cup pools, and although the likes of Gloucester, Cardiff Blues, Leicester, Edinburgh, Connacht, Castres, Exeter and Northampton will undoubtedly be setting their sights on higher goals, the Amlin Challenge Cup prize has been readily grabbed in recent seasons by Leinster, Biarritz Olympique and Cardiff Blues who all qualified from the Heineken Cup.
So, with even more thrills, spills, unpredictability and tension anticipated in the closing rounds of the tournament which never fails to produce for players and fans alike, 2014 can't come quick enough!