At the meeting with the Seven Freaks at the start of the novel, Qiu Chuji carried a huge copper urn that was stated to have a diameter that was more than a meter wide, and which was filled with wine. It was specifically stated that the urn by itself weighed 400 jin, and that the wine inside made it much heavier.
再看他手中托的那口大铜缸时,一惊之下,不由得欠身离椅。这铜缸是庙宇中常见之物,用来焚烧纸锭表章,直径 四尺有余,只怕足足有四百来斤,缸中溢出酒香,显是装了美酒,那么份量自必更加沉重,但他托在手里却不见如 何吃力。Based on the stated width (1.33 meters across) and the expected depth of a standard sacrificial urn of this size (at the very least 0.6 meters high, and probably higher), we can come up with a projected maximum capacity of at least 0.8 cubic meters. Given that wine pretty much has the same density as water, we can use water's density (1000 kg per cubic meter) to estimate the weight of the wine inside the urn as 800 kilograms, ie 1600 jin.After he saw the large copper urn held in the Daoist's hands, he couldn't help but unexpectedly rise in shock. Copper urns like this were commonly seen in monasteries and were used for burning incense. It was more than 4 feet wide and weighed at least 400 jin. The urn was overflowing with a fragrant scent; clearly, it was filled with wine. The weight, naturally, would be even greater. But this man was able to carry it without showing the slightest hint of strain.
In other words, the urn, if fully filled with wine, weighed at least 2000 jin; even if it was only half-filled, it would weigh at least 1200 jin! But Qiu Chuji was able to hold it up with ONE HAND! We know for a fact that it was filled with a good amount of wine; Zhang Ahsheng was able to drink wine from the urn just by lowering his head into it when he was holding it, and Ke Zhen'e was able to drink from it just by tilting it slightly when he held it up on his staff. So even if it wasn't filled to the brim, there was definitely a large amount of wine in the urn.
Now compare this to Ouyang Feng's performance on the boat when fighting Hong Qigong, and when he was trapped by a falling mast/sail.
那张帆又大又坚,连着桅杆横街,不下数百斤之重,欧阳锋跃了两次,都未能将帆掀开。他虽遭危难,心神不乱, 竖起蛇杖要撑开帆布,岂知蛇杖却被桅杆压住了竖不起来。他心中叹道:“罢了罢了,老儿今日归天 !”Qiu Chuji was able to very easily hold up a urn of base weight 400 jin, with total weight between 1200-2000 jin based on how much wine was in it, with one hand. But Ouyang Feng, when trapped by a sail weighing "several hundred jin," was unable to do anything; he wasn't even able to lift up the mast enough so that he could remove his staff! Yes, Ouyang Feng was in a very dangerous situation; the sail was burning, and he was trapped under it. But the novel specifically states that Ouyang Feng remained calm and did not panick (no Broken Wheel Monk panic-chokejob here).The sail was both large and solid, and was attached to the mast; it was at least several hundred jin in weight. Ouyang Feng tried jumping twice, but was unable to push the sail away. But although he was in a dangerous situation, he remained calm and didn't panick. He grabbed his Serpent Staff and tried to use it to prop the sail up. But unfortunately, the staff was trapped beneath the mast and he wasn't able to lift it up. Ouyang Feng sighed to himself, "Forget it, forget it, looks like this old man is going to Heaven today!"
This is all within the same novel, and 100% canon. This consequently proves 100% that Qiu Chuji has much stronger internal energy than Ouyang Feng; as Qiu Chuji was not a very physically imposing man, the fact that he was capable of a much greater strength feat than Ouyang Feng can only be explained by his greater internal energy.
Anyone care to dispute this?