Wah.. first time I've heard Tanabe being more comfortable than Eibach. For me it was the other way around on a Vios, but I guess it's all relative. And probably your MarkX is much heavier than the Vios so different performance?
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Well both Eibach & Tanabe have different types as well. The Eibach I've tried was the Pro-Kit which if I'm not mistaken is on the more aggressive side of their street springs. It lowered my Lancer by 4-5cm so it's very aggressive look (barely fit 1 finger into the front gap) and consequently the spring rate was also pretty hard! While the Tanabe I'm using now is the NF series (NF stands for Normal Feeling) which is Tanabe's most conservative spring, only lower by 2-3cm (still 2 finger gaps on all 4 corners).