It seems a very long time since the Gunners flopped at home to Aston Villa on the opening day of the Premier League season with calls for Arsene Wenger to gracefully depart, no summer signings and grumblings of another campaign of under-achievement.
But a 12-match unbeaten run in all competitions - 10 of them victories - plus the arrival of the fantastic Mesut Ozil, and all of a sudden Wenger is once again a visionary.
They stand on the brink of already booking their qualification into the knockout phase of the Champions League with double header against Borussia Dortmund that Wenger said will be "decisive" to their progress.
It will be the Frenchman's 64th birthday on Tuesday and his super-confident side at the moment will take some stopping.
The visitors scraped a 1-0 win over Hannover in the Bundesliga at the weekend thanks to a Marco Reus spot-kick with head coach Jurgen Klopp admitting his players ran out of steam physically following time away for the international break.
Even with that game under their belt to help sharpen up, the hosts still look like being too good.
Chelsea have been far from indestructible this season under Jose Mourinho and a shock opening 2-1 loss in this competition to Basel helped focus their minds somewhat.
They bounced back with a comfortable 4-0 success at Steaua Bucharest and have since built more confidence by beating Norwich and Cardiff, ultimately with a fair bit in hand and more of the panache we have come to expect.
A road trip to Schalke will be a much sterner test but Mourinho has his side rolling in the right direction and should be good enough for at least a point.
The game will see former Estadio do Dragao hero Hulk return to face his former club with his side in useful domestic form having lost just once from 13 games in the Russian League.
They defeated champions CSKA Moscow 2-0 at the weekend - Hulk was on the scoreline - and this might be just the right time to catch them as they bid to get a first victory in Europe.
Porto won all four home fixtures in this competition in 2012 but have already hit the buffers in that respect after going down 2-1 to the classy Atletico Madrid.
Poaching a win at 5/1 might be a much to ask but the 5/4 about Zenit in the double chance market could turn a profit with Hulk the driving force behind a competent display.